Buy a 5930k or wait for broadwell E

Solution
The main benefit of the 5930k over the 5820k and the 6700k are the extra (40) pci e lanes. Meaning that you can use 4 gpu sli. If you are not going to use quad sli makes no difference.

As for waiting for the broadwell, it should be just a few months away now. Personally I'd wait.

firefoxx04

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4K gaming requires GPU power. Usually the higher the resolution, the less of a bottleneck the CPU becomes. You could run 4k just fine with a run of the mill i5 as long as your GPU solution is capable.

CPU only cares about FPS. The higher the FPS, the higher the CPU usage. You wont be playing 4k at 144fps anytime soon.
 

CBender

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The main benefit of the 5930k over the 5820k and the 6700k are the extra (40) pci e lanes. Meaning that you can use 4 gpu sli. If you are not going to use quad sli makes no difference.

As for waiting for the broadwell, it should be just a few months away now. Personally I'd wait.
 
Solution
Broadwell-E is 5th Gen. However, the Broadwell-E version of the 5930k is only going to be slightly higher IPC vs. Haswell-E. It may OC a bit better and run higher memory frquencies due to 14nm shrink and other tweaks, but can't say for sure. Either way, for 4k gaming it's really no better than 5930k, maybe 1-2FPS at same frequency. No reason to wait if 4k is your only concern.