Citroen C5 vs BMW M4

What's the difference?

The C5 Aircross might seem like a niche European 'alternative' SUV, but I wish it wasn’t. The more mainstream players could learn a lot from how brilliantly this Citroen is packaged.

It is truly class leading in terms of passenger comfort and even luggage space, even shipping with great multimedia and safety in this base Feel grade.

Unless you really need to be towing, performance (or in this case, lack thereof) should be low on your SUV priority list anyway.

Brutal, bruising and utterly brilliant, the M4 CS will be an acquired taste due to its no-compromise approach, but those willing to take the leap will find a performance car like few others at their disposal.

It wouldn’t be a French car without a solid dollop of style, and the Aircross has heaps of it.

From the orange paint, to its floating rear light fittings and chevron emblazoned grille, the Citroen is nothing if not unique.

Just like the C4 range before it, the C5 Aircross inherits the plastic 'airbump' fittings under the doors, with the plastic-clad soft-roader look continuing over the wheelarches and across the C5’s front and rear.

There’s a lot going on, on both the front and rear of this SUV, but somehow it’s not really over-complicated, all the flourishes and highlights manage to flow into each other to maintain some semblance of consistency.

The C5’s rear is a little more tame, with body coloured panels contrasted with the plastic strip, gloss black highlights, and dual-square exhaust facades. The floating gloss-clad roof rails are a flashy if silly touch.

I’d personally argue it’s a better-looking car than its Peugeot 3008 sibling, although it looks built entirely for city-slickers rather than the adventurous type.

Inside it’s normal. For a Citroen. Gone are the days of floating steering wheels or overtly wacky instrument clusters, it’s all quite tame and that’s for the betterment of the brand.

That’s not to say it’s not a cool place to be, and I was surprised to find myself surrounded by classy fittings, quality soft-touch materials and an understated blocky design theme. The C5 gets a small, oval steering wheel which feels great in the hands.

Those awesome memory foam seats are finished in a slightly odd grey synthetic denim kind of material. Some hated it, but I thought it contrasted the car’s exterior and interior schemes well. The raised centre console gives front passengers an extra secure premium sort of feel.

The grey materials will be slightly divisive, but the number one annoyance for me was the complete lack of tactile buttons for adjusting the climate control or media functions. Is a volume knob too much to ask?

Other than that, the C5 has one of the most tame, practical interior treatments on any Citroen… possibly ever… without managing to be boring.

The M4 CS is familiar in all the right ways, but definitely looks significantly jacked up compared to its lesser siblings.

Part of that is the extensive use of carbon everywhere, from its bonnet panels to its roof, front lip, side skirting and boot spoiler. But also because of its super-muscular angles and creases, including the huge dome in its bonnet.

Also exclusive to this M4 CS is the light treatment, with the front LEDs lighting up with yellow highlights the brand says are supposed to be reminiscent of GT racing cars.

At the back, the rear lights are flush with fibre optic lighting, lending a flowing and unique light signature that looks epic at night.

Inside, it's a sea of carbon, with the lightweight racing seats, the dash inserts and the centre console all lined in it. It is a perfectly finished space, though, and one that's also flecked with red, including a 12 o'clock band on the thick-rimmed steering wheel, the seat backs, the contrast stitching and the paddle shifts.

Be warned, though, it takes some acrobatics to climb into or out of the CS. The seat bottoms have these super high edges that double as grab handles, but require some awkward contortions to navigate.

In short, it looks angry, this M4 CS, inside and out.

The C5 Aircross is one of the most practical SUVs you can buy in this segment in terms of interior space. There’s just loads of it, and plenty of smart features to back it up.

In the front you get some small trenches in the doors, lovely big cupholders in the centre console, along with a top-box which was a little shallow, but still handy, as well as a small cavity (seemingly designed to hold the key) and a big bin for stowing your wallet or phone.

Back seat occupants get decent leg and headroom, but what’s really special here is each passenger gets their own memory foam seat with enough width to travel in decent comfort. The centre passenger’s legroom isn’t even impeded by a big transmission tunnel.

Rear passengers also get pockets on the back of the front seats, dual air vents, small cupholders in the doors, and a 12-volt power outlet. With no drop-down armrest, it would be nice to see more practical cupholders in the door cards.

The boot is truly gigantic. Like, biggest in the segment gigantic. At a minimum it weighs in at 580L (VDA), but as an added boost, the rear passenger seats can be slid forward on a rail to grant a whopping 140 extra litres of space to 720L. With the rear seats down you’ll be able to make use of 1630L.

A power tailgate, able to be operated by waving a foot under the car is also standard, revealing a totally unimpeded aperture. So, not only does it have a class leading luggage area, but it’s also easy to use.

It all boils down to how you classify practicality in a car like this. I mean, the basic stuff is all there – it's got two doors, four seats and a boot capacity of 440 litres.

It measures 4801mm in length, 1918mm in width and 1399mm in height, and room for front seat riders is good, but less so for anyone you squeeze into the back. There are even ISOFIX points for a child seat.

But if you consider practicality the practical pursuit of performance, then the M4 CS has plenty of perks.

We're talking a $254,900 entry price for the M4 CS, which – despite my attempts at justification – is a lot. Remember, the regular M4 is $168,700, and the M4 Competition is $186,500, so we're talking a sizeable premium here.

BMW justifies that price increase in two ways. The first is scarcity, with the M4 CS limited to just 50 examples in Australia. And the second is by dialling up every aspect of the M4's performance to terrifying levels.

The engine outputs are up, the weight is 20kg down, there are better brakes, better seats, a louder exhaust, a stiffer chassis – it goes on and on.

We'll get to some of the performance stuff in a moment, but here's what else your money buys you with the M4 CS.

It starts outside with staggered alloys, 19-inch up front and 20-inch at the rear, wrapped in track-ready rubber. There's also hi-po 'M Compound' brakes with red calipers, lightweight carbon racing seats that are heated up front, an Alcantara-trimmed steering wheel, the 'M Carbon' exterior package with carbon bonnet and roof, adaptive 'M Suspension' and a titanium exhaust that howls like the winds of hell.

The less performance-focused stuff is similar enough to the other M4 models including a 12.3-inch centre screen with digital radio, Apple CarPlay and Android Auto, a second 14.9-inch screen that handles your driving data and a head-up display. There's also twin-zone climate control, Merino leather upholstery and ambient interior lighting.

But all of that is secondary, really. This is about performance, specifically of the brutal kind.

The C5 Aircross is powered by just one powerplant no matter which grade you pick. It’s a 1.6-litre turbocharged four-cylinder petrol engine, producing 121kW/240Nm.

It shares this engine with the Peugeot 3008 and the outputs compare well with the Renault Koleos’ Nissan-sourced 2.4-litre four-cylinder engine (126kW/226Nm) considering it’s much smaller and (theoretically) less thirsty.

The ever-smart Skoda Karoq is tough to beat in this segment with its 1.5-litre engine (110kW/250Nm) putting strong torque figures on the board.

The C5 Aircross sends power to the front wheels only via a six-speed automatic transmission, for a comparison the Koleos has a lackluster CVT auto, while the Karoq benefits from a seven-speed dual-clutch automatic.

BMW has found yet more grunt lurking in its trusty 3.0-litre 'M TwinPower' six-cylinder petrol engine, with the M4 CS now pumping out 405kW and 650Nm.

That's a decent jump from the 390kW and 620Nm served up by the M4 Competition, and a giant leap from the outputs of the 'base' M4 – 353kW and 550Nm.

Predictably, then, the CS is the fastest of the lot, knocking off the run from 0-100km/h in 3.4 seconds, compared to 3.5 and 4.2 in the Competition and M4, respectively. The top speed is also dialled up to 302km/h.

All that power is channeled through an eight-speed automatic and sent to all four wheels on demand, with the help of an 'Active M Differential'.

The 1430kg C5 is rated to consume 7.9 litres of mid-grade 95RON unleaded per 100km.

That’s about on-par for the segment, and in practice I managed a figure of 8.6L/100km. A litre over isn’t too bad for truly mixed driving.

The mid-grade fuel requirement is a bit of an annoyance, but it’s also to be expected from a small capacity turbocharged European engine. It’s primary competitors (with the exception of the Koleos) drink the same.

The M4 CS is fitted with a 59-litre fuel tank, which – given the BMW's official fuel claim of 10.2 litres per hundred kilometres – should deliver a driving range on a full tank of 541 kilometres.

But... BMW also says the regular M4 – you know, the one that makes 52 fewer kilowatts and 55Nm less torque – uses 10.1L/100km, so do with that information what you will.

Straight up, the C5 Aircross is not the most exciting car you can drive. It’s not even exciting for the segment, with the focus being refreshingly distant from sporty.

You’ll be getting sluggish acceleration comprised of an occasionally lazy six-speed auto transmission and a dollop of turbo lag every time you depress the accelerator pedal.

But the C5 Aircross is, refreshingly, not about being sporty at all. I’d argue Citroen is one of the few carmakers that really ‘gets’ what driving an SUV should be about. Comfort.

See, this SUV more than makes up for its lackluster performance by being possibly the nicest place to be behind the wheel in the segment.

We’ve covered how unreal the seats are in terms of their quality memory foam padding, but it doesn’t end there. The C5 has the same excellent well balanced steering from the rest of the Citroen and Peugeot passenger car ranges, as well as sensibly-sized tyres on small alloy wheels and the hydraulic cushion suspension.

It all adds up to a ride that’s quiet and makes most road corrugations, imperfections and potholes a complete non-issue.

The suspension does have its limits, hitting a particularly sharp bump or pothole will have the car bouncing off its shocks, but it’s simply awesome on 90 per cent of Australian urban roads. I wish more SUV mid-sizers rode like it.

It’s also super quiet thanks to “extra insulation” in the engine bay and the small alloy wheels.

The hardest and angriest M4 of all time is, perhaps unsurprisingly, hard and angry. This is a race track specialist, but because I don't happen to own one of those, my first experience with the barking (and barking mad) M4 CS was navigating my way back from BMW's inner-city dealership.

Like it or lump it, you're going to read some Porsche comparisons here, because you're talking not too far off base 911 Carrera money, and suddenly I find the two Germans doing battle for a spot in my dream garage.

First things first, the BMW won't be much chop for daily driving for most people. Happily, I have a sickness for uncomfortable sports cars. It tells me that no compromises have been made in the pursuit of punishing performance.

A good thing, too, because the BMW, at city speeds, can be punishing. Everything feels heavy, the seats aren't overly comfortable – especially the hard bits that tend to dig in when cornering – and it stiff-arms its way over road imperfections, that exhaust booming and barking as it does.

Again, I loved it, and you probably will, too. But it's still not the kind of car I'd relish sitting in the morning peak hour rush in.

But escape the confines of the city and the BMW M4 CS suddenly makes a whole heap of sense. The acceleration is genuinely brutal, and wonderfully theatrical, with that quad-tipped titanium exhaust barking and snarling as you rocket towards 100km/h.

The steering is brilliant, with feedback fed to your wrists via that thick-rimmed wheel, and the entire experience feels sharp, super engaging and edgy.

You can push the M4 hard and fast, and I'm certain my limited talents would run out far before the BMW's would, but there's this thrilling sense of peril sparked by the aggression of the experience, that I love.

It's like the magic of a roller-coaster, I guess. Even if you know nothing is going to happen, you never really know, right? And in that lies the magic.

But back to original question, this or a Porsche 911? There's no doubt a Carrera is a better all-rounder, in terms of comfy commuting and race track fun, but this angry M4 is all shouty theatrics, all of the time.

I bloody love it.

Expect no ANCAP rating here, I'm afraid. But the BMW 4 Series does wear a five-star rating from 2019.

The M4 CS gets six airbags (driver and passenger, side airbags, head airbags), along with what BMW calls its 'Driving Assistant Professional', which bundles active cruise control (with stop and go function), front and rear cross-traffic warning, 'Steering & Lane Control' and 'Lane Keeping with Side Collision Warning'.

All current Citroens are covered by a five-year/unlimited kilometer warranty, matching the widely accepted industry standard.

That’s all well and good, but it’s the very erm… European service pricing which is the killer here.

The C5 Aircross is covered by a capped price servicing program which costs between $458 and $812 per yearly visit, for an average of $602 per year for the life of the five year warranty.

It’s a bit of a let down given the Citroen’s cheapest fixed-price service is the equivalent to an expensive service at more mainstream brands.

The M4 CS is covered by BMW's five-year, unlimited-kilometre warranty, with condition-based servicing available in packs, which will cost you $3530 over five years/80,000km, or $2900 over four years/60,000km.