BMW 1 Series (2014) is 300 kg (661 lbs) lighter than BMW 5 Series (2014).
BMW 5 Series (2014) is 639 mm (25.16 inch) longer, 152 mm (5.98 inch) wider, 149 mm (5.87 inch) higher and has 79 liters (2.79 ft3) bigger cargo space than BMW 1 Series (2014).