BMW 8 Series (G15) (2018) is 419 mm (16.50 inch) longer and 98 mm (3.86 inch) wider than Mercedes GLA-Class (2016).
Mercedes GLA-Class (2016) is 153 mm (6.02 inch) higher, 529 kg (1,166 lbs) lighter and has 1 liters (0.04 ft3) bigger cargo space than BMW 8 Series (G15) (2018).