Alfa Romeo 4C (2015) is 33 mm (1.30 inch) wider and 445 kg (981 lbs) lighter than Mercedes GLA-Class (2017).
Mercedes GLA-Class (2017) is 422 mm (16.61 inch) longer, 427 mm (16.81 inch) higher and has 325 liters (11.48 ft3) bigger cargo space than Alfa Romeo 4C (2015).