Mercedes GLA-Class (2016) is 142 mm (5.59 inch) longer, 35 mm (1.38 inch) higher and has 41 liters (1.45 ft3) bigger cargo space than Seat Leon (2016).
Seat Leon (2016) is 12 mm (0.47 inch) wider and 182 kg (401 lbs) lighter than Mercedes GLA-Class (2016).