Audi S7 (2018) is 67 mm (2.64 inch) longer and 52 mm (2.05 inch) wider than Opel Insignia Sports Tourer (2015).
Opel Insignia Sports Tourer (2015) is 91 mm (3.58 inch) higher, 440 kg (970 lbs) lighter and has 25 liters (0.88 ft3) bigger cargo space than Audi S7 (2018).