BMW 6 Series Gran Turismo (2018) is 666 mm (26.22 inch) longer, 98 mm (3.86 inch) wider, 45 mm (1.77 inch) higher and has 188 liters (6.64 ft3) bigger cargo space than Mercedes GLA-Class (2016).
Mercedes GLA-Class (2016) is 400 kg (882 lbs) lighter than BMW 6 Series Gran Turismo (2018).