Mercedes GLA-Class (2018) is 128 mm (5.04 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 (2016).
Seat Leon (2016) is 350 kg (772 lbs) lighter than Mercedes GLA-Class (2018).