I will be the first to say it. What will you be using this system for? Gaming, editing, streaming, etc.
What are the rest of your specs?
I went from a 7700k to 10850k. 4 cores to 10 cores at the same 5ghz frequency. Same amount of RAM and same 1080 ti video card. Pushing a 2560x1440 gsync diplay. Didn't notice a difference day to day. Primarily single player gaming.
I'll add that I went from a 2600k @ 4.6 ghz to a 7700k @ 5 and also didn't notice a difference. I occasionally wonder if I'd still be happy sporting that 2600k. I think it's possible.