BMW i8 (2017) is 55 mm (2.17 inch) longer and 108 mm (4.25 inch) wider than Mercedes GLB-Class (2019).
Mercedes GLB-Class (2019) is 366 mm (14.41 inch) higher, 115 kg (254 lbs) lighter and has 416 liters (14.69 ft3) bigger cargo space than BMW i8 (2017).