Audi A8 (2014) is 28 mm (1.10 inch) wider and 173 kg (381 lbs) lighter than Mercedes X-Class (2017).
Mercedes X-Class (2017) is 203 mm (7.99 inch) longer, 359 mm (14.13 inch) higher and has 786 liters (27.76 ft3) bigger cargo space than Audi A8 (2014).