Alfa Romeo 4C (2015) is 57 mm (2.24 inch) wider and 432 kg (952 lbs) lighter than Mercedes C-Class (Coupe) (2017).
Mercedes C-Class (Coupe) (2017) is 698 mm (27.48 inch) longer, 225 mm (8.86 inch) higher and has 246 liters (8.69 ft3) bigger cargo space than Alfa Romeo 4C (2015).