2080Ti has been out almost twice as long as well.and the 5700xt is below the RTX 2080ti, so your point is?
For the price range and time period, 2060 Super 1.09% and 5700XT .81% has about the same amount of time for sells since they were like within a month of each other. AMD is doing OK here but not great either. I would think AMD would be extremely pleased if they could duplicate that percentage difference on each price range of cards on the upcoming generation, market share of 40% or better for AMD would be an exceptional improvement for discrete graphics and not so good for Nvidia even if they still lead.