BMW i8 (2016) is 88 mm (3.46 inch) wider and 351 kg (774 lbs) lighter than Mercedes E-Class (Estate) (2014).
Mercedes E-Class (Estate) (2014) is 206 mm (8.11 inch) longer, 203 mm (7.99 inch) higher and has 516 liters (18.22 ft3) bigger cargo space than BMW i8 (2016).