BMW 8 Series (G15) (2018) is 182 mm (7.17 inch) longer, 106 mm (4.17 inch) wider and has 1 liters (0.04 ft3) bigger cargo space than Mazda 3 (Sedan) (2019).
Mazda 3 (Sedan) (2019) is 104 mm (4.09 inch) higher and 518 kg (1,142 lbs) lighter than BMW 8 Series (G15) (2018).
