BMW 8 Series (G14) (2020) is 80 mm (3.15 inch) longer and 81 mm (3.19 inch) wider than Subaru Legacy (2015).
Subaru Legacy (2015) is 167 mm (6.57 inch) higher, 396 kg (873 lbs) lighter and has 66 liters (2.33 ft3) bigger cargo space than BMW 8 Series (G14) (2020).
