Mercedes E-Class (2019) is 501 mm (19.72 inch) longer, 271 mm (10.67 inch) wider, 105 mm (4.13 inch) higher and has 378 liters (13.35 ft3) bigger cargo space than Porsche Cayman (2018).
Porsche Cayman (2018) is 418 kg (922 lbs) lighter than Mercedes E-Class (2019).