BMW 3 Series Gran Turismo (2021) is 551 mm (21.69 inch) longer, 19 mm (0.75 inch) wider and has 162 liters (5.72 ft3) bigger cargo space than Citroen DS4 (2020).
Citroen DS4 (2020) is 17 mm (0.67 inch) higher and 142 kg (313 lbs) lighter than BMW 3 Series Gran Turismo (2021).