Kia Optima (2015) is 5 mm (0.20 inch) higher and 55 kg (121 lbs) lighter than Renault Talisman Grandtour (2017).
Renault Talisman Grandtour (2017) is 5 mm (0.20 inch) longer, 10 mm (0.39 inch) wider and has 62 liters (2.19 ft3) bigger cargo space than Kia Optima (2015).
