Hyundai Elantra GT (2016) is 6 mm (0.24 inch) higher and 252 kg (556 lbs) lighter than Kia Optima (2015).
Kia Optima (2015) is 555 mm (21.85 inch) longer, 79 mm (3.11 inch) wider and has 102 liters (3.60 ft3) bigger cargo space than Hyundai Elantra GT (2016).