It's not. Also a better CPU will help you future proof your PC since it's easier to just swap a GPU than to change motherboard RAM and CPU.
If you plan on gaming only, I'd even recommend a 8600k instead. Can OC and perform much better (especially at 1080p 1440p) depends on what performance you want and how much can your monitor handle. At 1080p you can get 10-60 more fps on most games (assuming you also have a strong GPU which you can replace in the future anyway).