BMW 8 Series (G14) (2018) is 39 mm (1.54 inch) longer and 227 kg (500 lbs) lighter than Mercedes M-Class (2015).
Mercedes M-Class (2015) is 24 mm (0.94 inch) wider, 449 mm (17.68 inch) higher and has 340 liters (12.01 ft3) bigger cargo space than BMW 8 Series (G14) (2018).