Chevrolet Sonic (Sedan) (2017) is 51 mm (2.01 inch) higher and 249 kg (549 lbs) lighter than Kia Optima (2015).
Kia Optima (2015) is 438 mm (17.24 inch) longer, 125 mm (4.92 inch) wider and has 88 liters (3.11 ft3) bigger cargo space than Chevrolet Sonic (Sedan) (2017).