BMW has finally revealed its long-awaited Mercedes CLS competitor: the 6-Series Gran Coupe. This Gran Coupe becomes the third installment in the 6er line-up along with the coupe and convertible variants.

The 4-door coupe which borrows majority of its exterior looks from the current 6-Series is 111mm longer than its coupe counterpart, from a total length of 5,007mm and a wheelbase of 2,968mm. In comparison, the current CLS has a 2,875mm wheelbase, which is slightly shorter than the Gran Coupe.

The Gran Coupe also has a decent boot size of 460 litres, but by dropping down the rear seat backrests, this can be increased to 1,265 litres. Interior features include a “4+1″ seating arrangement which offers a third rear seat, comfort-oriented rear seat backrest angle, Dakota leather upholstery, Electric Power Steering and Dynamic Damper Control, Auto Start-Stop function, Dynamic Damper Control, Servotronic and so on, all standard.

Optional features are made up by Integral Active Steering and Adaptive Drive, xDrive all-wheel drive system, camera-based Collision Warning with braking function (in conjunction with Active Cruise Control), Bang & Olufsen High-End Surround Sound System and the list goes on. BMW confirmed that the Gran Coupe will be available in both BMW Individual and M Sport trims from launch.

Now on to the juicers bits. Three engine options are available including an oil burner which is a 6-cylinder 3.0 liter TwinPower Turbo (two-stage turbocharging) diesel with 313 hp and 630 Nm of torque from 2,500 rpm in the 640d.

This variant offers an average fuel economy rating of between 5.5 and 5.7 litres per 100 kilometres. Then there is the 640i with its 6-cylinder 3.0 liter TwinPower Turbo (twin-scroll turbocharging) petrol with 320 hp and 450 Nm between 1,300 and 4,500 rpm.

The top spot is taken up by the 650i, powered by a 4.4 litre V8 also with TwinPower Turbo (two turbochargers). This unit can crank out 450 hp and 650 Nm of torque from 4,500 rpm. 0 – 100 km/h takes 4.6 seconds while top speed is rated at 250 km/h.

Fuel economy doesn’t look bad despite the engine size with an average of between 9.2 and 9.4 litres per 100 kilometers. This model is available in all-wheel-drive form as well and all variants come with an eight-speed automatic transmission.

Enjoy some high-res photos after the jump.