BMW 8 Series (G15) (2018) is 1286 mm (50.63 inch) longer, 257 mm (10.12 inch) wider and has 169 liters (5.97 ft3) bigger cargo space than Seat Mii (2020).
Seat Mii (2020) is 137 mm (5.39 inch) higher and 614 kg (1,354 lbs) lighter than BMW 8 Series (G15) (2018).