BMW 8 Series (G16) (2019) is 142 mm (5.59 inch) longer and 50 mm (1.97 inch) wider than Mercedes CLS-Class (2020).
Mercedes CLS-Class (2020) is 10 mm (0.39 inch) higher, 119 kg (262 lbs) lighter and has 80 liters (2.83 ft3) bigger cargo space than BMW 8 Series (G16) (2019).