Cadillac CT6 (2018) is 498 mm (19.61 inch) longer, 70 mm (2.76 inch) wider, 64 mm (2.52 inch) higher and has 77 liters (2.72 ft3) bigger cargo space than Mercedes C-Class (Coupe) (2017).
Mercedes C-Class (Coupe) (2017) is 113 kg (249 lbs) lighter than Cadillac CT6 (2018).