Mercedes CL-Class (2014) is 717 mm (28.23 inch) longer, 72 mm (2.83 inch) wider, 124 mm (4.88 inch) higher and has 328 liters (11.58 ft3) bigger cargo space than Porsche Cayman (2015).
Porsche Cayman (2015) is 815 kg (1,797 lbs) lighter than Mercedes CL-Class (2014).