Mercedes S-Class Coupe (2016) is 634 mm (24.96 inch) longer, 96 mm (3.78 inch) wider, 119 mm (4.69 inch) higher and has 250 liters (8.83 ft3) bigger cargo space than Porsche 718 Cayman (2017).
Porsche 718 Cayman (2017) is 509 kg (1,122 lbs) lighter than Mercedes S-Class Coupe (2016).