Mercedes S-Class Coupe (2015) is 648 mm (25.51 inch) longer, 97 mm (3.82 inch) wider, 121 mm (4.76 inch) higher and has 238 liters (8.40 ft3) bigger cargo space than Porsche Cayman (2019).
Porsche Cayman (2019) is 545 kg (1,202 lbs) lighter than Mercedes S-Class Coupe (2015).