McLaren 720S (2020) is 165 mm (6.50 inch) longer, 259 mm (10.20 inch) wider and has 41 liters (1.45 ft3) bigger cargo space than Porsche Cayman (2014).
Porsche Cayman (2014) is 97 mm (3.82 inch) higher and 62 kg (137 lbs) lighter than McLaren 720S (2020).