Even at the end of its dominant 2014 Formula 1 season, the Mercedes W05 still had a huge margin over its opposition in race pace - so it's not surprising that the W06 officially revealed at Jerez on Sunday is very much an evolution of its predecessor.
So subtle are the changes that, aside from the mandatory new nose, the car is hard to differentiate from its forebear. But modifications have been made both to the chassis and the powertrain.
Last year's W05 featured several unique details on its chassis and aero design, from the car's U-shaped nose and clever conjoined front lower wishbones, to its tiny sidepods and huge 'monkey seat' winglet. The hybrid powertrain was equally unique, with its split turbo, compact exhausts and cartridge gearbox.