Mercedes GLA-Class (2015) is 154 mm (6.06 inch) longer, 35 mm (1.38 inch) higher and has 41 liters (1.45 ft3) bigger cargo space than Seat Leon (2014).
Seat Leon (2014) is 12 mm (0.47 inch) wider and 186 kg (410 lbs) lighter than Mercedes GLA-Class (2015).