McLaren 570GT (2017) is 114 mm (4.49 inch) longer and 292 mm (11.50 inch) wider than Mercedes GLA-Class (2015).
Mercedes GLA-Class (2015) is 293 mm (11.54 inch) higher, 100 kg (220 lbs) lighter and has 51 liters (1.80 ft3) bigger cargo space than McLaren 570GT (2017).