Cadillac ATS (2014) is 351 mm (13.82 inch) longer, 26 mm (1.02 inch) wider and has 40 liters (1.41 ft3) bigger cargo space than Mercedes A-Class (2015).
Mercedes A-Class (2015) is 13 mm (0.51 inch) higher and 109 kg (240 lbs) lighter than Cadillac ATS (2014).