Mercedes GLA-Class (2016) is 867 mm (34.13 inch) longer, 159 mm (6.26 inch) wider, 16 mm (0.63 inch) higher and has 208 liters (7.35 ft3) bigger cargo space than Seat Mii (2017).
Seat Mii (2017) is 364 kg (802 lbs) lighter than Mercedes GLA-Class (2016).