The all-new 2015 BMW 4 Series Gran Coupe may have a coupe-style fastback profile, but there's otherwise not much truth in the advertising. More accurately, the 4-door 4 Series Gran Coupe is like a 3 Series sedan with a sleeker rear roofline and a hatchback trunk. That rakish roof means there's less headroom than in a 3 Series,
yet the Gran Coupe will cost you more. Is it worth the stretch over BMW's already excellent bread-and-butter sedan?