Mercedes E-Class (2018) is 487 mm (19.17 inch) longer, 270 mm (10.63 inch) wider, 103 mm (4.06 inch) higher and has 390 liters (13.77 ft3) bigger cargo space than Porsche 718 Cayman (2017).
Porsche 718 Cayman (2017) is 382 kg (842 lbs) lighter than Mercedes E-Class (2018).