McLaren GT (2020) is 54 mm (2.13 inch) longer and 317 mm (12.48 inch) wider than Mercedes CLA-Class (2018).
Mercedes CLA-Class (2018) is 224 mm (8.82 inch) higher, 86 kg (190 lbs) lighter and has 50 liters (1.77 ft3) bigger cargo space than McLaren GT (2020).