BMW 8 Series (G15) (2018) is 68 mm (2.68 inch) longer and 87 mm (3.43 inch) wider than Hyundai i40 (2015).
Hyundai i40 (2015) is 129 mm (5.08 inch) higher, 232 kg (511 lbs) lighter and has 85 liters (3.00 ft3) bigger cargo space than BMW 8 Series (G15) (2018).