BMW 7 Series (2018) is 178 mm (7.01 inch) longer, 63 mm (2.48 inch) wider, 7 mm (0.28 inch) higher and has 44 liters (1.55 ft3) bigger cargo space than Mazda 3 (Sedan) (2020).
Mazda 3 (Sedan) (2020) is 382 kg (842 lbs) lighter than BMW 7 Series (2018).
