BMW 8 Series (G15) (2018) is 383 mm (15.08 inch) longer, 106 mm (4.17 inch) wider and has 56 liters (1.98 ft3) bigger cargo space than Mazda 3 (Hatchback) (2015).
Mazda 3 (Hatchback) (2015) is 114 mm (4.49 inch) higher and 620 kg (1,367 lbs) lighter than BMW 8 Series (G15) (2018).