BMW 8 Series (G14) (2018) is 5 mm (0.20 inch) wider and 27 kg (60 lbs) lighter than Mercedes S-Class Coupe (2017).
Mercedes S-Class Coupe (2017) is 183 mm (7.20 inch) longer, 75 mm (2.95 inch) higher and has 50 liters (1.77 ft3) bigger cargo space than BMW 8 Series (G14) (2018).