Chevrolet Sonic (Sedan) (2018) is 51 mm (2.01 inch) higher and 294 kg (648 lbs) lighter than Kia Optima (2016).
Kia Optima (2016) 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) (2018).