Citroen DS4 (2017) is 24 mm (0.94 inch) wider than Mercedes B-Class (2014).
Mercedes B-Class (2014) is 118 mm (4.65 inch) longer, 31 mm (1.22 inch) higher, 43 kg (95 lbs) lighter and has 127 liters (4.48 ft3) bigger cargo space than Citroen DS4 (2017).