Audi A7 Sportback (2017) is 529 mm (20.83 inch) longer, 175 mm (6.89 inch) higher and has 436 liters (15.40 ft3) bigger cargo space than Audi R8 (2015).
Audi R8 (2015) is 33 mm (1.30 inch) wider and 195 kg (430 lbs) lighter than Audi A7 Sportback (2017).