4080 is more like a 4070 which competes quite good with the best of AMD 7900xtx. Also back in the day 7970 was also competing with nVIDIA's mainstream sold as high end gtx680. AMD also didn't have something for 1080ti for a while or 2080ti (Vega VII was only around 2080 performance) and so on.
Normally Nvidia can comand higher prices plus is happy to sell lower end cards as higher end ones when AMD doesn't have something fast enough - like this gen and previous ones. Considering stuff such as the fabrication process and all the experience from both, competitors is improbable to have a really, really big difference between them. Overall speaking, of course.
They better not mess up Stalker 2 and Alan Wake 2!
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