BMW 8 Series (G14) (2020) is 148 mm (5.83 inch) longer and 92 mm (3.62 inch) wider than Mercedes C-Class (2015).
Mercedes C-Class (2015) is 103 mm (4.06 inch) higher, 488 kg (1,076 lbs) lighter and has 130 liters (4.59 ft3) bigger cargo space than BMW 8 Series (G14) (2020).