I personally thinks it's evidence enough, at least for me, seeing the where the difference in performance came from when I built my new PC. Performance in my game improved to do my GPU, not my CPU.

Probably didn't explain my statement that well though.

What I'm meaning is, you can't simply spend lots of money on the CPU and forget about the GPU and expect minecraft to run well.

Minecraft's performance isn't solely reliant on how great your CPU is.