BMW 8 Series (G14) (2018) is 3 mm (0.12 inch) wider and 222 kg (489 lbs) lighter than Mercedes S-Class (2016).
Mercedes S-Class (2016) is 402 mm (15.83 inch) longer, 151 mm (5.94 inch) higher and has 150 liters (5.30 ft3) bigger cargo space than BMW 8 Series (G14) (2018).