BMW 635d Sport
Sport variant holds road particularly well. Integrated spoiler has been added to bootlid
Shifter is new
Cabin is beautifully built, but could do with more stowage space
Impressive diesel now offered in 6-Series
BMW 635d Sport boot
Rival: Mercedes CLS320 CDI
While it’s not strictly a two-door coupé, Mercedes’ ultra-stylish CLS is also available with a strong diesel. The 224bhp 3.0-litre V6 isn’t as powerful, clean (200g/km) or efficient (37.2mpg) as the BMW, but it is significantly cheaper, costing £43,957.