The Genesis G70 is a small luxury car, and the Genesis G80 is a luxury midsize car. As the categorization implies, the G80 is a larger vehicle. However, we will break down the exact difference in spacing between the two. The Genesis G70 Trunk: 10.5 cubic feet The Genesis G80 Trunk: 13.1 cubic feet The Genesis G70 Passenger Volume: 94 cubic feet The Genesis G80 Passenger Volume: 104 cubic feet The head and legroom for both of these vehicles are pretty similar. Overall, if you are looking for a larger luxury sedan, the Genesis G80 is a better choice for you. If you're trying to compare 2022 Genesis G70 vs. G80 agility, then the Genesis G70 may be your winning ride.