Mercedes E-Class (Coupe) (2020) is 466 mm (18.35 inch) longer, 60 mm (2.36 inch) wider, 139 mm (5.47 inch) higher and has 263 liters (9.29 ft3) bigger cargo space than Porsche Cayman (2016).
Porsche Cayman (2016) is 245 kg (540 lbs) lighter than Mercedes E-Class (Coupe) (2020).