BMW 4 Series (2020) is 308 mm (12.13 inch) longer, 56 mm (2.20 inch) wider and has 76 liters (2.68 ft3) bigger cargo space than Mazda 3 (Hatchback) (2018).
Mazda 3 (Hatchback) (2018) is 57 mm (2.24 inch) higher and 340 kg (750 lbs) lighter than BMW 4 Series (2020).