The reason to go for the 13600K instead of the 12 is that it costs the same. Intel isnt in the habit of fire-saling last gen CPUs. Hell, 10400s still go for within 20$ of MSRP. So, if youre going to slap down ~300$ for a CPU, might as well get the newer one with 4 more cores and better IPC. If there was a stark difference in price, then yeah, the 12600K is still a great gaming CPU and would likely produce results so similar to the 13600K at enthusiast resolutions as to not be noticable, but since theyre basically the same price, might as well get the better of the two.