Cadillac ATS-V (2017) is 257 mm (10.12 inch) longer and 7 mm (0.28 inch) wider than Mercedes GLA-Class (2015).
Mercedes GLA-Class (2015) is 79 mm (3.11 inch) higher, 238 kg (525 lbs) lighter and has 127 liters (4.48 ft3) bigger cargo space than Cadillac ATS-V (2017).