Mercedes C-Class (Coupe) (2017) is 988 mm (38.90 inch) longer and 90 mm (3.54 inch) wider than Opel Adam (2015).
Opel Adam (2015) is 75 mm (2.95 inch) higher, 464 kg (1,023 lbs) lighter and has 31 liters (1.09 ft3) bigger cargo space than Mercedes C-Class (Coupe) (2017).