BMW 1 Series (2015) is 420 kg (926 lbs) lighter than BMW 7 Series (2015).
BMW 7 Series (2015) is 769 mm (30.28 inch) longer, 137 mm (5.39 inch) wider, 57 mm (2.24 inch) higher and has 155 liters (5.47 ft3) bigger cargo space than BMW 1 Series (2015).