Mercedes GLS-Class (2020) is 493 mm (19.41 inch) longer and 325 mm (12.80 inch) higher than Opel Insignia (2015).
Opel Insignia (2015) is 128 mm (5.04 inch) wider, 787 kg (1,735 lbs) lighter and has 185 liters (6.53 ft3) bigger cargo space than Mercedes GLS-Class (2020).