Kia K900 (2020) is 182 mm (7.17 inch) longer and 44 mm (1.73 inch) wider than Opel Insignia Sports Tourer (2020).
Opel Insignia Sports Tourer (2020) is 27 mm (1.06 inch) higher, 385 kg (849 lbs) lighter and has 110 liters (3.88 ft3) bigger cargo space than Kia K900 (2020).