BMW 8 Series (G15) (2018) is 39 mm (1.54 inch) longer and 226 kg (498 lbs) lighter than Mercedes M-Class (2014).
Mercedes M-Class (2014) is 24 mm (0.94 inch) wider, 447 mm (17.60 inch) higher and has 270 liters (9.53 ft3) bigger cargo space than BMW 8 Series (G15) (2018).