Audi A4 (2015) is 316 mm (12.44 inch) longer, 8 mm (0.31 inch) wider, 168 kg (370 lbs) lighter and has 45 liters (1.59 ft3) bigger cargo space than Mercedes GLA-Class (2017).
Mercedes GLA-Class (2017) is 184 mm (7.24 inch) higher than Audi A4 (2015).