BMW 1 Series (2015) is 15 kg (33 lbs) lighter than Mercedes GLA-Class (2015).
Mercedes GLA-Class (2015) is 88 mm (3.46 inch) longer, 39 mm (1.54 inch) wider, 73 mm (2.87 inch) higher and has 61 liters (2.15 ft3) bigger cargo space than BMW 1 Series (2015).