Citroen C4 (2017) is 195 mm (7.68 inch) longer, 186 mm (7.32 inch) higher, 175 kg (386 lbs) lighter and has 73 liters (2.58 ft3) bigger cargo space than Mercedes SLK-Class (2017).
Mercedes SLK-Class (2017) is 28 mm (1.10 inch) wider than Citroen C4 (2017).