BMW 5 Series Gran Turismo (2018) 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 (2014).
Mercedes B-Class (2014) is 89 mm (3.50 inch) higher and 304 kg (670 lbs) lighter than BMW 5 Series Gran Turismo (2018).