BMW i8 (2016) is 3 mm (0.12 inch) longer and 132 mm (5.20 inch) wider than Mercedes C-Class (Coupe) (2020).
Mercedes C-Class (Coupe) (2020) is 116 mm (4.57 inch) higher, 10 kg (22 lbs) lighter and has 202 liters (7.13 ft3) bigger cargo space than BMW i8 (2016).