BMW 8 Series (G15) (2020) is 433 mm (17.05 inch) longer and 68 mm (2.68 inch) wider than Mercedes GLA-Class (2017).
Mercedes GLA-Class (2017) is 270 mm (10.63 inch) higher, 261 kg (575 lbs) lighter and has 15 liters (0.53 ft3) bigger cargo space than BMW 8 Series (G15) (2020).