BMW 8 Series (G16) (2020) is 142 mm (5.59 inch) longer and 50 mm (1.97 inch) wider than Mercedes CLS-Class (2018).
Mercedes CLS-Class (2018) is 10 mm (0.39 inch) higher, 134 kg (295 lbs) lighter and has 80 liters (2.83 ft3) bigger cargo space than BMW 8 Series (G16) (2020).