BMW 8 Series (G14) (2018) is 251 mm (9.88 inch) longer, 132 mm (5.20 inch) wider and has 19 liters (0.67 ft3) bigger cargo space than Mercedes C-Class (Coupe) (2014).
Mercedes C-Class (Coupe) (2014) is 91 mm (3.58 inch) higher and 318 kg (701 lbs) lighter than BMW 8 Series (G14) (2018).