Mercedes E-Class (2014) is 501 mm (19.72 inch) longer, 54 mm (2.13 inch) wider, 150 mm (5.91 inch) higher and has 378 liters (13.35 ft3) bigger cargo space than Porsche Cayman (2019).
Porsche Cayman (2019) is 475 kg (1,047 lbs) lighter than Mercedes E-Class (2014).