BMW i8 (2017) is 885 kg (1,951 lbs) lighter than Mercedes GLS-Class (2020).
Mercedes GLS-Class (2020) is 646 mm (25.43 inch) longer, 14 mm (0.55 inch) wider, 530 mm (20.87 inch) higher and has 201 liters (7.10 ft3) bigger cargo space than BMW i8 (2017).