Audi Q8 (2018) is 86 mm (3.39 inch) longer, 143 mm (5.63 inch) wider, 196 mm (7.72 inch) higher and has 304 liters (10.74 ft3) bigger cargo space than Opel Insignia Sports Tourer (2014).
Opel Insignia Sports Tourer (2014) is 575 kg (1,268 lbs) lighter than Audi Q8 (2018).