Mercedes GLC-Class (2017) is 1099 mm (43.27 inch) longer, 245 mm (9.65 inch) wider, 181 mm (7.13 inch) higher and has 99 liters (3.50 ft3) bigger cargo space than Seat Mii (2020).
Seat Mii (2020) is 790 kg (1,742 lbs) lighter than Mercedes GLC-Class (2017).