Does anyone have either of these chips - intel 5820k or 6700k? I'm looking to building a new machine to upgrade from current i7 setup, top of the list is better preview, especially with 4k footage. Anyone have a good setup thats super smooth preview with gh4 4k files in vegas?
If the 5930K or 5960X are out question than I recommend the 5820K. I would however also buy a R9 390X and a closed loop water cooler to OC the CPU to 4.0-4.2GHz. As for the GH4 footage, try transcoding it with Catalyst Browse or Prepare to XAVC-Intra as this is a much better format for Vegas.
If you're in no big hurry, it might be worth reading about the Broadwell E. The specs of the Broadwell-E are on the street. It's a die shrink to 14 nm rather than a big architectural change.
If you don't care about being on the bleeding edge, you might start to see some price pressure on the current Socket 2011 processors in the next few months. I'm already seeing ads.