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 184 liters (6.50 ft3) bigger cargo space than Seat Mii (2020).
Seat Mii (2020) is 253 kg (558 lbs) lighter than Mercedes GLA-Class (2018).