BMW 8 Series (G15) (2018) is 1109 mm (43.66 inch) longer, 218 mm (8.58 inch) wider and has 179 liters (6.32 ft3) bigger cargo space than MINI Roadster (2015).
MINI Roadster (2015) is 48 mm (1.89 inch) higher and 679 kg (1,497 lbs) lighter than BMW 8 Series (G15) (2018).