McLaren 650S Coupe (2015) is 95 mm (3.74 inch) longer and 289 mm (11.38 inch) wider than Mercedes GLA-Class (2014).
Mercedes GLA-Class (2014) is 291 mm (11.46 inch) higher, 73 kg (161 lbs) lighter and has 277 liters (9.78 ft3) bigger cargo space than McLaren 650S Coupe (2015).