BMW 1 Series (2014) is 13 mm (0.51 inch) wider than Chevrolet Sonic (Sedan) (2018).
Chevrolet Sonic (Sedan) (2018) is 57 mm (2.24 inch) longer, 105 mm (4.13 inch) higher, 204 kg (450 lbs) lighter and has 62 liters (2.19 ft3) bigger cargo space than BMW 1 Series (2014).