BMW i8 (2016) is 3 mm (0.12 inch) longer and 132 mm (5.20 inch) wider than Mercedes C-Class (Estate) (2014).
Mercedes C-Class (Estate) (2014) is 149 mm (5.87 inch) higher, 65 kg (143 lbs) lighter and has 336 liters (11.87 ft3) bigger cargo space than BMW i8 (2016).