BMW 1 Series (2014) is 321 mm (12.64 inch) longer and 13 mm (0.51 inch) wider than Chevrolet Sonic (Hatchback) (2018).
Chevrolet Sonic (Hatchback) (2018) is 95 mm (3.74 inch) higher, 270 kg (595 lbs) lighter and has 24 liters (0.85 ft3) bigger cargo space than BMW 1 Series (2014).