McLaren 675LT Coupe (2016) is 168 mm (6.61 inch) longer, 295 mm (11.61 inch) wider, 47 kg (104 lbs) lighter and has 33 liters (1.17 ft3) bigger cargo space than Porsche Cayman (2015).
Porsche Cayman (2015) is 105 mm (4.13 inch) higher than McLaren 675LT Coupe (2016).