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as discussed before, g80 is likely a lot heavier with fancier seats, interior, amenities. not the same cars at all.
The Ioniq 5 has way fancier seats than the G80, they're full-on recliners with leg extensions.
The cars have the exact same wheelbase, and will likely weigh roughly the same if they have the same battery size. A few dozen pounds of extra sound deadening on the G80 don't contribute to much when both cars will be near the 5000 pound territory with their battery packs.
From the specs so far, the range and acceleration are extremely close.