McLaren 720S (2020) is 281 mm (11.06 inch) wider and 18 kg (40 lbs) lighter than Mercedes CLA-Class (2016).
Mercedes CLA-Class (2016) is 87 mm (3.43 inch) longer, 242 mm (9.53 inch) higher and has 267 liters (9.43 ft3) bigger cargo space than McLaren 720S (2020).