Four 8 Series Gran Coupe engines are on offer, the range kicking off with the 340hp 840i sDrive petrol version we tried, the only one featuring rear wheel drive. The other three variants all feature xDrive 4WD as standard. There's an 840d diesel derivative, which uses the brand's familiar 3.0-litre six-cylinder in-line diesel and delivers a maximum output of 320hp, with prodigious peak torque of 680Nm. Above that sit two 'M'-badged variants, with the one most will probably choose being the M850i derivative, which uses a 530hp version of the 4.4-litre twin-turbocharged petrol V8 you'll find in the brand's M5 super saloon. An M Sport exhaust delivers a snarly soundtrack, there's 750Nm of torque and 62mph from rest takes just 3.7s. If that's somehow not fast enough, you'll want to talk to your dealer about the even quicker M8 Competition model, which has the same 4.4-litre petrol V8 tuned up to 625hp, in which form it delivers 750Nm of torque. That flagship variant is capable of 62mph from rest in just 3.2s.
Across the range, there are the usual 'Driving Experience Control' modes - 'Eco', 'Comfort', 'Sport' and 'Sport+'. For a more focussed and sporty handling, Integral Active Steering is fitted as standard to reduce the turning circle when manoeuvring. This also increases agility at moderate speeds and optimises poise and assurance when changing lanes and cornering at high speeds. It becomes more direct as the speed builds but allows the driver to manoeuvre at low speeds with minimal steering wheel movement. Optional active roll stabilisation further enhances the handling characteristics. Electric swivel motors on the front and rear axles ensure particularly fast and precise compensation of lateral forces.
The style of this 8 Series Gran Coupe is very similar to that of its Coupe and Convertible showroom stablemates, but it has a wheelbase that's 201mm longer in order to incorporate a couple of extra rear doors. Unlike obvious segment 'Grand Turismo'-style rivals like the Porsche Panamera and the Audi A7 Sportback (but like its closest competitor the Mercedes CLS), this BMW has a traditional notchback boot rather than a hatchback.
As in other 8 Series models, the interior is awash with high-precision details and features a driver-centric cockpit and low-set sports seats featuring integral head restraints and trimmed in soft Merino leather. Despite the coupe-style pretensions here, this is a proper four-seater; there's certainly adequate head and legroom in the rear, even for loftier adults. The boot meanwhile (which has a high lip) is big enough for a quartet of adults too, being 440-litres in size (90-litres less than you'd get in a 5 Series saloon if you're wondering). Larger objects like skis can be dealt with by a through-loading hatch. If you need more room, then releasing a pair of neat boot sidewall catches flattens the rear seatbacks, a standard feature that can free up considerably more cargo space.
Prices start at around £70,000 for the 840i sDrive - or around £73,000 for the 840d xDrive. The M850i xDrive is around £98,000. The M8 Competition xDrive model will set you back around £121,000. Across the range, equipment highlights include Merino leather upholstery, a Head-up display, Active Park Distance Control and the BMW 'Live Cockpit Professional' infotainment set-up, which includes a 12.3 inch instrument binnacle display screen and a 10.25-inch centre-dash monitor. Via this, you'll have access to an adaptive nav system, a hard-drive-based multimedia system with 20GB, two USB ports, plus Bluetooth and WiFi interfaces.
Plus there's plenty of cutting-edge camera-driven safety kit and autonomous driving tech.The driver assistance systems process camera images as well as data gathered by ultrasonic and radar sensors to monitor the vehicle's surroundings, to warn of potential hazards and to minimise the risk of an accident with corrective braking or steering inputs. The car is equipped as standard with Cruise Control with braking function, as well as Collision and Pedestrian Warning with City Braking, the latest version of which also alerts the driver when a cyclist is detected. Depending on the situation, the system can bring the vehicle to a halt to either avoid a collision or minimise its consequences.
Just because you're spending over £70,000 on a luxury car of this kind, it doesn't mean you'll be paying through the nose to keep it on the road. Even the M850i xDrive with its turbocharged petrol V8 is capable of 24.6mpg (WLTP combined cycle) and CO2 emissions of 226g/km (NEDC). The 840i sDrive enhances that to 33.2mpg and 168g/km. And the 840d xDrive diesel improves that to 39.2mpg and 162g/km. For the M8 Competition xDrive, it's 25.2mpg and 244g/km.
Routine maintenance is dictated by 'Condition Based Servicing' that monitors oil level and engine wear, taking into account how long it's been and how far the car has travelled since its previous garage visit. To help plan ahead for the cost of regular work, at point of purchase you'll be offered a 'BMW Service Inclusive' package that lasts for three years and 36,000 miles. With this, after a one-off payment, you'll have the peace of mind of knowing that all normal work on the car has been paid for during this period, including items such as oil, spark plugs and filters.
On to the warranty package. BMW offers a warranty that lasts for three years, no matter how many miles you complete. You can also insure your car through BMW, though as most 8s will be funded with company money through a lease deal, this brokerage fees are likely to be bundled into that.
Of all the motivations you might have for spending serious money on a full-sized luxury car, perhaps the most important is the need for it to make you feel special. And that's exactly how you'll feel with one of these in your driveway. It's what sets this executive four-door coupe apart from the kind of BMW 7 Series saloon you could have for much the same sort of money. And it's also what makes this a rarer, more exclusive choice than a rival Mercedes CLS or Audi A7 and a more beautifully resolved design than the only other two really direct alternatives, Porsche's Panamera and Maserati's Quattroporte.
True, you do still need to spend plenty on the options list to create the 'ultimate driving machine' the Munich maker's ads promise. Do this though and you'll get yourself a car with dynamic capability no rival can match. So, in summary, is this the best luxury model BMW makes right now? There are some who would say so. And the best four-door premium coupe? Yes, that as well.