The Ryzen 9 5950X is still the fastest PC x86-64 processor out there.
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Core i9 12900K processor review - Performance - Content Creation Blender (guru3d.com)
For more benches look at the review - follow the link..
Cherry picking one result doesn't make one CPU "the fastest processor out there". The review from here show the 12900K as faster than the 5950X in Blender, probably because the memory used, 2x16 GB DDR5 5200 MHz (CL40) on Guru3D and 2x 16 GB G.SKILL Trident Z5 RGB DDR5-6000 36-36-36-76 2T Gear 2 on the test here on Techpowerup. Also even on Guru3D the 12900K is faster on Cinebench MT, when considering other tests, like the one from Guru3D using DDR4 3600(CL16), benchmarks from GN, HUB/Techspot, and others, in reality the 12900K is similar to the 5950X in MT performance, losing or winning depending on the application tested and the memory used, but a lot of people don't do only MT tasks and at gaming(which I personally think is not important, but many think it is) and ST tasks the 12900K is faster.
The 5950X is a great CPU, and really efficient on top of that, even though it's slower than the 12900K in ST tasks, it makes up for it by performing similarly to it while using half the power in full loads, but cherry picking one graph where the 5950X wins and calling it "the fastest PC x86-64 processor out there", which also ignores AMD own Threadripper lineup, just looks bad.
On topic: $500 is a good price for the 5950X, about the same price as the 12900F, so you have the choice between a CPU that is a bit faster than the other while using close to half the power in full loads, and one that is less efficient in full load but faster in ST and gaming.
The 5900X still a bit too high in my opinion, for $312 you can get the similar performing at MT tasks 12700F, which at least according to Techspot testing uses about the same amount of power as the 5900X, and is also faster in games and ST tasks. The 5900X for around $300 would be a more competitive.
But anyway, good to see AMD prices finally starting to match Intel. The 5900X costing $450~500 while you could get the 12700F for ~$315 was a joke. Hopefully neither AMD nor Intel overprice their upcoming CPUs, it would be way better to be able to choose between 2 good options, rather than being forced into one because the other is too expensive.