BMW 5 Series Gran Turismo (2020) is 550 mm (21.65 inch) longer, 81 mm (3.19 inch) wider and has 44 liters (1.55 ft3) bigger cargo space than Mercedes B-Class (2017).
Mercedes B-Class (2017) is 79 mm (3.11 inch) higher and 350 kg (772 lbs) lighter than BMW 5 Series Gran Turismo (2020).