Mercedes GLA-Class (2017) is 147 mm (5.79 inch) longer, 18 mm (0.71 inch) wider, 152 mm (5.98 inch) higher and has 55 liters (1.94 ft3) bigger cargo space than Seat Leon (2014).
Seat Leon (2014) is 354 kg (780 lbs) lighter than Mercedes GLA-Class (2017).