Mercedes C-Class (2017) is 155 kg (342 lbs) lighter than Opel Insignia Sports Tourer (2020).
Opel Insignia Sports Tourer (2020) is 227 mm (8.94 inch) longer, 46 mm (1.81 inch) wider, 71 mm (2.80 inch) higher and has 80 liters (2.83 ft3) bigger cargo space than Mercedes C-Class (2017).