BMW 4 Series Gran Coupe (2017) is 363 mm (14.29 inch) longer and 58 mm (2.28 inch) wider than Mazda 6 Atenza (2017).
Mazda 6 Atenza (2017) is 153 mm (6.02 inch) higher, 538 kg (1,186 lbs) lighter and has 40 liters (1.41 ft3) bigger cargo space than BMW 4 Series Gran Coupe (2017).
