BMW 4 Series (2020) is 1034 mm (40.71 inch) longer, 168 mm (6.61 inch) wider and has 199 liters (7.03 ft3) bigger cargo space than MINI Roadster (2015).
MINI Roadster (2015) is 6 mm (0.24 inch) higher and 355 kg (783 lbs) lighter than BMW 4 Series (2020).