Mercedes GLC-Class (2014) is 34 mm (1.34 inch) wider and 146 mm (5.75 inch) higher than Opel Insignia Sports Tourer (2020).
Opel Insignia Sports Tourer (2020) is 257 mm (10.12 inch) longer, 500 kg (1,102 lbs) lighter and has 210 liters (7.42 ft3) bigger cargo space than Mercedes GLC-Class (2014).