McLaren GT (2020) is 267 mm (10.51 inch) longer and 291 mm (11.46 inch) wider than Mercedes GLA-Class (2014).
Mercedes GLA-Class (2014) is 280 mm (11.02 inch) higher, 176 kg (388 lbs) lighter and has 1 liters (0.04 ft3) bigger cargo space than McLaren GT (2020).