BMW 8 Series (G15) (2020) is 426 mm (16.77 inch) longer and 98 mm (3.86 inch) wider than Mercedes GLA-Class (2014).
Mercedes GLA-Class (2014) is 153 mm (6.02 inch) higher, 429 kg (946 lbs) lighter and has 1 liters (0.04 ft3) bigger cargo space than BMW 8 Series (G15) (2020).