First, it brought us four-door coupes. Now, behold the Sport Activity Coupe with four doors and a rear hatch. All other manufacturers are envious of BMW’s success with its X6, which spawned a brand-new vehicle class. Available in xDrive 35i, xDrive 50i and M versions, this elegant luxury crossover delivers 300, 400 or 555 horsepower. The X6 is unquestionably the German brand’s most distinctive vehicle, but the passengers in the back won’t feel particularly pampered.