BMW 6 Series vs Maserati Granturismo

What's the difference?

This isn't a car for everyone's tastes, but if you fit in to the buyer group that just doesn't really know what they want in a luxury car, it could be the perfect fit for your family. The 6 Series GT is a practical large prestige car, albeit one that will likely find very few buyers.

From the most compelling engine sound this side of … well, anything … to a timeless, shapely body the GranTurismo is a surprising car. While its age is catching up to it in a few areas (fuel consumption, in-car entertainment) what matters most is that this Maserati still lights the fire in the belly.

There is no denying the 6 Series GT looks better than the old 5 Series GT. It isn't as frumpy, it looks more sporty, and to me it appears to have grown into its identity with more conviction than its predecessor.

That said, I don't necessarily like the look very much - it's a bit like a BMW X6 that has been rounded off a little and lowered down substantially. But I can appreciate some of the finer design aesthetics that it offers up: the frameless windows are a nice touch, and the swooping roofline looks smoother than a duck's back.

Other things like the active grille shutters and the air breathers ahead of the front doors are nice functional touches, and to my eye it lives up to BMW's hope of it looking "smooth but muscular". You can get the 630i with either the M Sport package, like you see here, or the more sedate Luxury Line, which is, well, more luxurious looking.

The M Sport styling and equipment package you see in the images here - with M aero kit and 19-inch wheels (ours had been upgraded to optional 20s) - help out with the athletic look of this very big vehicle.

It's huge in fact. The length of the 630i is 5091mm long, it measures 1902mm wide and sits at 1538mm tall, with a lengthy 3070mm wheelbase.

All that equates to a lot of room in the cabin, and what a sumptuous and delightful place it is to be - leather, wood and plush finishes abound.

As has already been (indelicately) mentioned, this is a design that is not only ageing well, it still looks pretty fresh from most angles. The only let down are the over-sized tail-lights that look more at home on something less exotic. Those aside, it's a deeply pretty car, with lovely surfacing, the highlight being those beautiful rising guards that funnel your vision down the bonnet.

Interior packaging isn't the GT’s strong point. Inside is pretty cosy with a fat transmission tunnel that makes for a narrow footwell.

With the Sport you get carbon-backed seats that are thinner in the backrest allowing for more room in the tight rear bucket. Snug they may be, but head and leg room is surprisingly good. The white leather interior of this one may not have been to everyone’s taste, but it was certainly beautifully put together.

The boot is fairly small but will fit more than, say, the similarly sized (but double the price) Ferrari FF.

The GranTurismo MC Sport comes in two versions. Both have six-speed gearboxes, but one has the rear-mounted robotised manual while our version was the six-speed ZF automatic, which is mated directly to the engine.

The auto weighs in at $295,000, $23,000 cheaper than the Stradale. Both cars come standard with Poltrona Frau leather, carbon fibre trim inside and out, alloy pedals, bi-xenon headlights, foglights, parking sensors front and rear, 20-inch MSC alloys, keyless entry, electric seats, Alcantara headlining, cruise control, dual-zone climate control and electric adjustment for the steering wheel.

Sadly, time has marched on from when the GranTurismo's entertainment system was first presented to the world. It's a weird, unwieldy system that takes a lot of getting used to, with buttons that don't always seem to do what their label says. Pairing the phone was arduous and while most owners do that once, it does speak to the overall usability.

Having said that, the 11-speaker Bose stereo pumped out some pretty good sound and once the satnav's input method is deciphered, it worked surprisingly well given its fairly basic presentation on the seven-inch screen.

Under the bonnet of the 630i is a 2.0-litre four-cylinder turbocharged petrol engine, which produces 190kW of power (at 6500rpm) and 400Nm of torque (from 1550-4400rpm). It uses an eight-speed automatic transmission, and is rear-wheel drive.

That may not seem a lot considering the size of this machine, but consider that some of the steamiest four-cylinder hot hatches have nearly the same outputs, and you realise this engine offers up a far-from slouched approach to propulsion.

The 640i xDrive has a 3.0-litre six-cylinder turbocharged engine with 250kW of power and 450Nm of torque. It gets the same eight-speed auto, but as the xDrive naming indicates, it's all-wheel drive.

But this is the one you'd prefer if you want to hit highway speed in a hurry - the 0-100km/h claim is 5.3 seconds, where the 630i takes a full second longer (6.3sec) according to the company.

Maserati's 4.7L V8, inherited from the then-parent Ferrari, is a cracker. Based on the V8 found in the F430, it has a gloriously silly redline of 8000rpm. Peak power is 338kW at 7000rpm and 520Nm at 4750rpm.

The 0-100km/h is dispatched in 4.8 seconds and top speed is 298km/h.

The transmission is a six-speed ZF automatic and fuel economy is a sobering 14.3L/100km on the combined cycle.

I'll put this out there - if you like to drive, there are BMW models for less than this one that will put a much bigger smile on your face. Like, a 440i Gran Coupe, or even just a 330i sedan…

But if you're in BMW's target market - that being older executive buyers who want space and luxury as a priority over thrills at the wheel, you could do a lot worse.

That's because the 6 Series GT lopes along the highway without fuss - the engine easily coping with the demands of overtaking moves, the adjustable drive modes allowing a light steering and wafting suspension feel to wile away the kilometres.

There are 'Comfort' and 'Comfort Plus' modes, but the latter is a bit too spongy and can be boaty feeling. The Comfort setting is made for the highway.

It is actually pretty agile for its dimensions.

If you decide to deviate from the straight sections, you'll be able to explore a little bit of dynamic range, especially when you dial up the 'Sport' mode, which changes the damper settings, steering weight, throttle and transmission response, and even the digital dials in front of the driver to a more aggressive look.

Our car had the 'Integral Active Steering' setting, which is a variable ratio steering system that includes rear steering - that essentially helps make is more turnable in corners at highway speed, and easier to park at lower speeds. It's difficult to say whether the assistance is excellent or not short of driving a car without the tech, but to this tester it was hard to hide the size and weight (1835kg kerb weight) of the vehicle.

That isn't to say it's clumsy or lumbering - it is actually pretty agile for its dimensions, though it makes a lot more sense on long drives and coastal cruises than it does in the narrow and twisty alpine roads of the Snowy Mountains Highway that I tested it on.

There's good grip from the tyres, and strong response from the powertrain - but if it were my money, and I had to have a 6 Series for whatever reason, I'd be looking towards the 640i model, which has a thumping six-cylinder with 250kW/450Nm - certainly an engine that would be more at home in this car. Plus that model comes with AWD.

There are few more impressive sounds in the automotive world than a Maserati-tuned V8. Even on start-up, the smooth V8 gives you a little bellow to wake the neighbours and when in non-Sport mode it quickly settles into a quiet idle. The exhaust has the now-familiar valving that opens up when you switch it into Sport and if you don’t default to that when driving the GT, you're probably dead inside.

The V8 makes a tremendously addictive racket, getting better with every rev as the tacho needle swipes right to the redline.

When compared with the lightweight sportster from which the engine is lifted, you won't be moving quite as quickly, but the noise and the sharp-shifting transmission will keep you happy. Tunnels are worth the price of entry as you crank the windows down and flip the paddles to find second or even first.

It's hard to pick that the transmission is a traditional automatic. The shifts are fast and positive but never violent – that would be out of character – responding properly to the paddles. In automatic, it's smooth and gentle.

The steering is mighty impressive too. There's enough feel to keep you interested and entertained but not so much you’ll be overwhelmed in the daily drive. The nose changes direction with a flick of the wrists and the moderately-firm Skyhook suspension does a good job of making the rest of the car follow without undue body roll.

Despite rolling on 20-inch alloys shod with sticky 245s up front and 285 at the rear, cruising in the GT is surprisingly quiet and comfortable. WithSport mode off, it's a very agreeable place to be. The seats are hugely comfortable, even in the rear, which seems impossible.

The MC comes standard with six airbags, ABS, stability and traction controls, pre-tensioned and load-limited seatbelts front and rear.

There is no ANCAP safety rating for the GranTurismo.