BMW M440I vs Audi RS5

What's the difference?

BMW has once again delivered a supremely enjoyable sports car with its new 2021 4 Series.

Sure, it might have love-it or hate-it styling, but those that dismiss the 4 Series based solely on looks are missing out on a wonderful driving experience.

With the base 420i offering all the style in a relatively affordable pricetag, while the all-wheel-drive grip of the M440i adds extra assurance at a more premium price, BMW's new 4 Series should cater to anyone looking for a premium sports coupe.

It's hard to look past the fact that the RS 5 Sportback is more than $50k more expensive than an S5 Sportback, which itself is hardly cheap. But is it the pick of the RS 4 and RS 5 family? Probably, but I’m personally still a sucker for the RS 4’s wagon shape

I also reckon it’s currently the pick of the three fast German options, and I love that you can get it in this bodystyle.

Note: CarsGuide attended this event as a guest of the manufacturer, with travel and meals provided.

Let’s get this out of the way. The 2021 BMW 4 Series is not an ugly car, despite what you may think from the press photos found online.

Is it to everyone’s tastes? Of course not, but I find the gaudy, in-your-face gold-on-black that is Versace’s signature styling a little gross … so your milage will definitely vary on the 4 Series like mine does with high-end fashion.

In person, that grille is nowhere near as overwhelming as pictures may have led you to believe, and blends in very nicely with the aggressive and muscular front end of the 4 Series.

In profile, the high shoulder line and slim glasshouse add to the sportiness, as does the sloping roofline and butch rear haunches.

The rear though, is arguably the 4 Series best exterior angle, as the pinched bumper, wraparound tail-lights, large exhaust outlets and subtle rear diffuser combine well for a properly sporty and premium look.

All Australian-spec cars come with the M Sport package, meaning a full bodykit, and 19-inch wheels to make even the boggo 420i look aggressive on the road.

Does it work? Well if it wasn’t wearing a BMW badge then it might not get away with this ostentatious styling, but being a big premium player, we think the 4 Series gets away with being as brash and in-your-face as it is.

We actually love that BMW has taken a risk with the 4 Series’ aesthetics and is willing to push the envelope because, after all, it could have just looked like the 3 Series sans-two doors, and that’s just a bit too safe, isn’t it?

Inside, the 4 Series is familiar BMW territory, which means a thick-rimmed steering wheel, glossy shifter and brushed metal accents, as well as high-quality materials throughout.

The dashboard-integrated multimedia system is a particularly nice touch, as are the metal accents that separate the lower and upper halves of the cabin.

So, is there anything interesting about the design? Absolutely. It’s got the internet talking more than usual and will no doubt draw the eye of those wanting to stand out from the often-samey crowd of German sports cars.

From the B-pillar forward, the RS 5 Sportback is identical to the Coupe, with the same deep and aggressive front apron to set it aside from the lesser S5 and A5 models. The same applies at the rear, with a bespoke rear bumper with large oval exhaust outlets on either side.

It also scores the delightfully pumped wheelarches on each corner of its mechanical siblings, along with the same 20-inch wheels.

Like the coupe though, one detail that seems to be missing from the previous RS 5 is a significantly wider track. Compared with the S5 Sportback, the RS 5 Sportback’s track is just 11mm wider at the front and 20mm at the rear, so if you halve those figures per side they’re likely just from additional camber in the wheel alignment settings.

So those wheelarch blisters are largely for aesthetics, rather than a necessary adjustment to allow for a broader stance.

Enough of the comparisons though, the five-door liftback bodystyle gives it a uniquely sleek yet practical appearance, with all of the tasty performance cred of the coupe and wagon.

Also as I alluded before, BMW is unable to build you an M4 Gran Coupe, which would be its BMW equivalent, due to the regular Gran Coupe being built in a different factory to the 3 Series sedan and 4 Series coupe. And Mercedes-AMG’s C 63 bodystyle options are limited to sedan, coupe, wagon and convertible - there just isn’t a five-door liftback on the list.

The RS 5 Sportback’s interior is a continuation of the beautifully detailed coupe and wagon, with real carbon fibre, aluminium and leather tastefully applied leather that has a subtle edginess that really fits the Audi RS brand.

Measuring 4768mm long, 1842mm wide, 1383mm tall and with a 2851mm wheelbase, the 2021 BMW 4 Series certainly looks commanding on the road, and the generous proportions do well for interior space too.

Of note though, the M440i is slightly longer (4770mm), wider (1852mm) and taller (1393mm) than the 420i and 430i, but the slight variance doesn’t translate to any perceivable difference in practicality.

Up front, there is plenty of space for driver and passenger, with a wide array of seat adjustability offering nearly the perfect position for nearly everyone regardless of shape or size.

Storage options include a generous door pocket with separate bottle holder, large central storage cubby, generous glove box, and two cupholders sited between the shifter and climate controls.

We love that the wireless smartphone charger is tucked well away just ahead of the cupholders, meaning you don’t have to worry about keys or loose change scratching up your screen, and it doesn’t eat into any of the other storage options around the cabin.

Being a coupe, you wouldn’t expect heaps of room in the second row, and the BMW 4 Series certainly doesn’t defy expectations in this regard.

Adult passengers can get in the back easy enough, thanks to auto-folding front seats, but once there, head- and shoulder-room can be a bit tight, while legroom is dependent on the height of front passengers.

We’ve certainly been in worse back seats though, and the deeply recessed seats help alleviate some of the headroom issues, but its not a space for the claustrophobic.

Open the boot and the 4 Series will swallow up to 440 litres of volume and, thanks to the wide space, can easily accommodate a set of golf clubs or weekend luggage for two.

The second row is divided 40:20:40, so you can fold down the middle to transport skis (or timber from Bunnings) while still ferrying four.

Folding the rear seats down will increase your cargo volume, but the aperture between the boot and cabin is quite small, so you might want to keep that in mind before heading to Ikea.

This is where it’s hard not to make Goldilocks analogies. Where the RS 5 coupe has a decent boot with a small, sedan-like opening and a back seat for two that’s difficult to access via the front doors, the RS 4 has a great wagon boot with a huge opening and a back seat for three that’s easy to access because it has back doors.

The RS 5 Sportback is closer to the latter, but sacrifices the cargo height of the wagon and the sloping roofline will mean that taller passengers may want for more headroom and easier access to the back seat. It does retain the wagon’s third seating position back there though, and neither back seat compromise is an issue for my 172cm height.

Its 480 Litres VDA seats-up boot capacity is a match for the S5 Sportback, which is only 25 litres short of the RS 4. Like the S5, a space saver spare sits beneath the boot floor.

The RS 5 Sportback also ticks important convenience boxes like dual cup holders front and rear, bottle holders in each door, decent oddments storage and auxiliary connections front and rear, plus ISOFIX child seat mounts for both outward rear seat positions.

If you’ve ever found yourself perusing Audi’s mid-size RS line-up and been disappointed by the lack of back doors in anything without a wagon body, the RS 5 Sportback is the solution.

Two door coupes are a pain to live with unless you have no need for the back seat, and I’m led to believe that there are some who aren’t enchanted by the RS 4 Avant’s epic cool factor.

If this is you, and your local freeway onramp isn’t long enough to suit the S5 Sportback’s 4.7s 0-100km/h claim, you’ll also be delighted to know that the RS 5 Sportback is priced at the same $157,700 (before on roads) as the RS 5 Coupe, and $4800 above the RS 4. You won’t be as delighted by the $51,900 premium over the S5 Sportback.

The standard equipment is a match also, with the Quattro sport rear differential, RS sports exhaust and 'Dynamic Ride Control' with adaptive dampers all on the list.

You’ll also find the black 'Fine Nappa' leather sports seats with diamond stitching, Bang & Olufsen 3D audio, LED headlights, gloss black exterior details, panoramic sunroof and red brake calipers.

The Audi virtual cockpit driver display also features, plus RS-specific tyre pressure, torque and g-force readouts and a shift light.

The RS 5 Sportback aligns with the MY19 RS 5 coupe spec upgrade, which brings a head-up display, wireless phone charger and USB outlets for rear passengers.

The RS 5-exclusive 'Sonoma Green' paint seen on the coupe is also now available on the Sportback for the same extra $1950 any colour aside from Nardo grey will add to the sticker price.

One detail you don’t get on the coupe is the auto liftback with gesture control, similar to the RS 4’s tailgate.

Both the entry-level and mid-tier 4 Series variants (420i and 430i respectively) are powered by a 2.0-litre turbocharged petrol engine.

Under the bonnet of the 420i, the engine produces 135kW/300Nm, while the 430i ups the ante to 190kW/400Nm.

The flagship (at launch) M440i meanwhile, scores a 3.0-litre turbo-petrol inline six delivering 285kW/500Nm.

All three engines are paired with an eight-speed automatic transmission, with no manual option available on any grade.

The 420i and 430i send drive to the rear wheels, resulting in a zero to 100km/h sprint time of 7.5 and 5.8 seconds respectively, while the all-wheel-drive M440i needs just 4.5s.

Stacked up against its German rivals, the 4 Series offers a decent engine line-up, but doesn’t excel at any level compared to the Audi A5 and Mercedes-Benz C-Class coupe.

The RS 5 Sportback is a genuine mechanical match for the coupe and RS 4, which means the same and impressive 331kW/600Nm 2.9-litre twin-turbo V6 and delightfully adaptive eight-speed ZF torque converter auto.

Max power is available from 5700-6700rom, while peak torque is accessible all the way from 1900-5000rpm.

The Quattro all-wheel drive system retains it 60 per cent native torque bias for more of a rear-drive dynamic. 

Officially, the 420i will sip 6.4 litres per 100km, while the 430i is slightly thirstier at 6.6L/100km.

Both aforementioned 4 Series variants will need 95 RON at the bowser.

The heavier and more potent M440i needs 7.8L/100km, while also using the more expensive 98 RON fuel.

We only drove through Melbourne country roads in our brief time with all three grades of the 4 Series and could not ascertain a reliable fuel economy figure.

Our driving did not cover an extended freeway journey or any inner-city driving, so check back to see if the quoted figures hold up to scrutiny once we get more time with the car.

Given the familiarity of the RS 5 Sportback’s mechanical package, there’s also no surprises with its fuel consumption.

The official combined fuel consumption figure is 8.9L/100km, which is 0.1 more than the coupe, and the same as the RS 4.

We managed a rare feat during our 350-plus kilometre drive taking the back way from Canberra to Goulburn, to Oberon, then to Bathurst via Lithgow, where we managed to match the official combined figure on the car’s trip computer.

While it’s a good rule of thumb that you can do this on a steady motorway cruise, it was mighty impressive to do it along the flowing country route with regular climbs and overtaking.

It is worth noting though that like all RS models, the RS 5 Sportback commands expensive 98 RON Premium unleaded as a minimum.

Anything wearing a BMW badge promises a fun and engaging drive, after all the brand’s tagline used to be the ‘ultimate driving machine’, which is exacerbated in a sporty two-door.

Luckily then, the 4 Series delivers the goods and is a thoroughly enjoyable drive in all three grades.

Taking the already brilliant new-generation 3 Series as a base, BMW has made the 4 Series lower, and added additional stiffening in the front and rear for a taught and agile handling machine.

The rear track is also increased, while the front wheels have more negative camber to help with mid-corner grip.

Though the 420i and 430i might not draw any headlines, they 2.0-litre turbo-petrol pair are fun to steer and precise with their inputs.

The 420i especially doesn’t have the punch to match its aggressive looks, but is perfectly capable at slower speeds and still a delight to tip in a corner.

The 430i meanwhile, delivers more thrills thanks to its more potent engine, but it can get a bit trashy higher in the rev range.

However, the pick of the bunch for us the M440i, not only for its extra spicy engine, but also the assurance of all-wheel drive.

Now it might be sacrilege to some to not have a rear-drive BMW, but the rear-biased xDrive system in the M440i is wonderfully tuned to deliver the same sort of natural driving characteristic of a two-wheel-drive model.

Undoubtedly the near-perfect weight distribution helps with this, while the wonderfully low driving position means the whole car feels like it pivots around the driver when turning the wheel.

The M Sport differential in the rear is also great at propelling out you out of the bends, while the adaptive suspension also has great variability between comfort and sport settings.

If we had any criticism with the driving experience? We’d have liked a bit more aural theatre, but BMW have to save the louder pops and crackles for the full-fat M4, right?

A big caveat here though is that we have yet to experience the new 4 Series in a suburban setting, with our launch route taking us directly to some twisty country roads.

We also never got to drive the 4 Series in a freeway setting, meaning all of the driving was done in twisty country roads where you would expect a BMW to excel.

There’s a good chance you’ve skipped straight to this point, and if you've driven the excellent RS 5 Coupe or the RS 4 you won’t find any surprises in the RS 5 Sportback. This is a very good thing.

Compared to its muscular looks, its general refinement around town is still a really nice surprise for a car of this performance calbre. It’s not hard to imagine driving your grandmother around in comfort. In fact, she would have been right at home on our 350-plus kilometre country cruise between Canberra and Bathurst. 

You might miss the V8 growl from an AMG, but the V6 does make a nice bark once you give it some decent throttle, and it delivers those 331kW and 600Nm very effectively through those two turbos. As I often find myself saying these days, this thing is so easy to drive so fast!

Its very impressive 3.9 second 0-100km/h claim feels entirely realistic, which matches the coupe and trumps the RS 4 by two tenths.

You probably won’t be surprised to hear that the ZF eight speed torque converter auto feels right at home with the RS5, being smooth as around town, and as responsive and quick to shift as you’d ever want it to be when you’re getting up it.

Its overall refinement does mean it’s not quite as exciting to drive fast as the AMGs or BMW Ms, even with the controls and mechanicals tightened up in Dynamic mode.

Our best opportunity to put it through its performance paces was via the surprise set of bends hidden between Bathurst and Sofala, where it simply honked its way uphill. You instantly forget that it's a rather large five seater with almost room for a pony in the boot. There’s miles of grip, it steers really nicely and the big brakes do a really good job under pressure. This, is a proper RS.

While not specifically stated, the RS 5 Sportback should be covered by the same five-star ANCAP safety rating as the rest of the fixed-roof A5 family. Note that this rating was awarded based on older 2015 criteria though.

It matches the RS 5’s impressive list of standard safety features, which includes front city AEB with pedestrian detection.

Interestingly, the initial Sportbacks being delivered to Australia match the six airbag count of the coupe, which covers front and side airbags for the driver and passenger, along with curtain airbags covering the front and rear.

The second batch and all future RS 5 Sportback examples will match the eight airbag count of the wagon, which adds rear side airbags to the list above. If you’re about to place an order, I’d strongly recommend insisting on the eight airbag version that this score is based on.

Like all new BMW models, the 4 Series comes with a three-year/unlimited kilometre warranty.

However, the benchmark for premium brands belongs to Mercedes-Benz, who offer a five-year/unlimited kilometre warranty, while Genesis matches the time period but limits travel to 100,000km.

Scheduled servicing for the 4 Series occurs every 12 months or 16,000km.

At the time of purchase, BMW offers a five-year/80,000 ‘basic’ service package that covers scheduled changing engine oil, filter, spark plugs and brake fluids.

This package costs $1650, which works out to be a very reasonable $330 per service.

A more thorough ‘plus’ plan is also available for $4500 that also covers brake pads/discs, clutch and windscreen wiper replacements over the same five-year/80,000km period.

Like all Audis, the new RS 5 Sportback is covered by a three year, unlimited kilometre warranty. This is short of the five year-plus periods that now form the status quo among mainstream brands, but equal to the terms offered by BMW and Mercedes-Benz. Lexus differs by offering a four year, 100,000km plan. 

RS 5 Sportback service intervals are a generous 12 month/15,000km though. 

Another detail to be aware of is that RS models are still exempt from Audi’s Service Plan Pricing capped price servicing plan.