Its not a bad CPU, its still quite capable. Very similar to something like a Ryzen 7 5800X in performance, which is still half decent. But the problem is that it was and still is ridiculously overpriced for the amount of performance you'd get from it. The CPU alone generally goes for a similar price as a considerably faster & better new CPU and motherboard combined.

The 11900K wasn't even worth buying when it released. As already said, it's basically a 11700K that can clock 200-300 MHz higher and pulls 15W more. Which isn't much at the clocks both boost to anyway. As GamersNexus put it "it's a waste of sand" The same 8 core/16 thread chip as it's i7 counterpart. The 10900K had hat least more cores, as does the 12900K. And since both, the 11700K and 11900K are overclockable, you could do that yourself. It's a curiosity. A chip made so that they could claim to have the fastest CPU for a moment. If you already have a LGA1200 board and want to max it out, rather look at the 10900K or 11700K, both have different strengths, but will be a better choice. If you just want to put together a fast computer from used parts, the same applies but Core i 13th gen and AMD also exist. Stuff like the i5-13600K, i7-13700K, i9-13900K, Ryzen 5800X3D, 5950X, etc.