BMW 3 Series Gran Turismo (2021) is 155 mm (6.10 inch) longer, 230 kg (507 lbs) lighter and has 21 liters (0.74 ft3) bigger cargo space than BMW X4 (2015).
BMW X4 (2015) is 52 mm (2.05 inch) wider and 115 mm (4.53 inch) higher than BMW 3 Series Gran Turismo (2021).