BMW 6 Series Gran Turismo (2020) is 680 mm (26.77 inch) longer, 68 mm (2.68 inch) wider and has 174 liters (6.14 ft3) bigger cargo space than Mercedes GLA-Class (2018).
Mercedes GLA-Class (2018) is 72 mm (2.83 inch) higher and 232 kg (511 lbs) lighter than BMW 6 Series Gran Turismo (2020).