Mercedes CLS-Class (2018) is 562 mm (22.13 inch) longer, 82 mm (3.23 inch) wider, 124 mm (4.88 inch) higher and has 358 liters (12.64 ft3) bigger cargo space than Porsche Cayman (2016).
Porsche Cayman (2016) is 370 kg (816 lbs) lighter than Mercedes CLS-Class (2018).