Cadillac CT6 (2018) is 767 mm (30.20 inch) longer, 76 mm (2.99 inch) wider and has 12 liters (0.42 ft3) bigger cargo space than Mercedes GLA-Class (2015).
Mercedes GLA-Class (2015) is 21 mm (0.83 inch) higher and 268 kg (591 lbs) lighter than Cadillac CT6 (2018).