BMW 7 Series (2020) is 727 mm (28.62 inch) longer, 116 mm (4.57 inch) wider and has 29 liters (1.02 ft3) bigger cargo space than Mercedes B-Class (2014).
Mercedes B-Class (2014) is 90 mm (3.54 inch) higher and 620 kg (1,367 lbs) lighter than BMW 7 Series (2020).