Cadillac CTS-V (2014) is 442 mm (17.40 inch) longer and 38 mm (1.50 inch) wider than Mercedes GLA-Class (2015).
Mercedes GLA-Class (2015) is 39 mm (1.54 inch) higher, 512 kg (1,129 lbs) lighter and has 33 liters (1.17 ft3) bigger cargo space than Cadillac CTS-V (2014).