McLaren 650S Coupe (2015) is 283 mm (11.14 inch) wider and 82 kg (181 lbs) lighter than Mercedes C-Class (Coupe) (2017).
Mercedes C-Class (Coupe) (2017) is 174 mm (6.85 inch) longer, 206 mm (8.11 inch) higher and has 212 liters (7.49 ft3) bigger cargo space than McLaren 650S Coupe (2015).