BMW 8 Series (G15) (2018) is 1286 mm (50.63 inch) longer, 257 mm (10.12 inch) wider and has 207 liters (7.31 ft3) bigger cargo space than Seat Mii (2017).
Seat Mii (2017) is 137 mm (5.39 inch) higher and 893 kg (1,969 lbs) lighter than BMW 8 Series (G15) (2018).