Mercedes GLA-Class (2018) is 853 mm (33.58 inch) longer, 189 mm (7.44 inch) wider, 133 mm (5.24 inch) higher and has 222 liters (7.84 ft3) bigger cargo space than Seat Mii (2017).
Seat Mii (2017) is 532 kg (1,173 lbs) lighter than Mercedes GLA-Class (2018).