FIAT 500 (2016) is 685 kg (1,510 lbs) lighter than Mercedes B-Class (2020).
Mercedes B-Class (2020) is 869 mm (34.21 inch) longer, 169 mm (6.65 inch) wider, 74 mm (2.91 inch) higher and has 220 liters (7.77 ft3) bigger cargo space than FIAT 500 (2016).