Cadillac XTS (2017) is 839 mm (33.03 inch) longer, 73 mm (2.87 inch) wider, 68 mm (2.68 inch) higher and has 169 liters (5.97 ft3) bigger cargo space than Mercedes A-Class (2016).
Mercedes A-Class (2016) is 422 kg (930 lbs) lighter than Cadillac XTS (2017).