Cadillac XTS (2015) is 708 mm (27.87 inch) longer, 48 mm (1.89 inch) wider, 7 mm (0.28 inch) higher and has 88 liters (3.11 ft3) bigger cargo space than Mercedes GLA-Class (2016).
Mercedes GLA-Class (2016) is 422 kg (930 lbs) lighter than Cadillac XTS (2015).