BMW 8 Series (G16) (2020) is 807 mm (31.77 inch) longer and 164 mm (6.46 inch) wider than Mazda 6 Atenza (2018).
Mazda 6 Atenza (2018) is 135 mm (5.31 inch) higher, 616 kg (1,358 lbs) lighter and has 81 liters (2.86 ft3) bigger cargo space than BMW 8 Series (G16) (2020).