BMW 5 Series Gran Turismo (2015) is 613 mm (24.13 inch) longer, 114 mm (4.49 inch) wider, 2 mm (0.08 inch) higher and has 14 liters (0.49 ft3) bigger cargo space than Mercedes B-Class (2017).
Mercedes B-Class (2017) is 735 kg (1,620 lbs) lighter than BMW 5 Series Gran Turismo (2015).