BMW 8 Series (G15) (2018) is 383 mm (15.08 inch) longer, 107 mm (4.21 inch) wider and has 93 liters (3.28 ft3) bigger cargo space than Mazda 3 (Hatchback) (2020).
Mazda 3 (Hatchback) (2020) is 99 mm (3.90 inch) higher and 567 kg (1,250 lbs) lighter than BMW 8 Series (G15) (2018).