From what I have observed key dates have not moved more or higher than the overall coin market, the exception to this is for any toned example the the market deems better than most. Currently toned coins, even those that I would consider rather blah toning; has been the hottest part of the market. If you have a key date coin with nice toning that is where the big jumps are seen, however other than some outliers and gold the coin market has not seen the same leap in prices that other collectables have over the last year or two. Prices have been stronger than pre pandemic for the top of the market and toned material while the lower end stuff and average material has moved up at a slower rate if at all.