Cadillac XTS (2015) is 446 mm (17.56 inch) longer, 42 mm (1.65 inch) wider, 59 mm (2.32 inch) higher and has 29 liters (1.02 ft3) bigger cargo space than Mercedes C-Class (2016).
Mercedes C-Class (2016) is 372 kg (820 lbs) lighter than Cadillac XTS (2015).