I've even heard on some places that AMD refuses to work with them completely. I am not 100% sure this is accurate info as i've heard it on a forum, but i've seen some extremely questionable "benchmarks" where gtx 960 stomps R9 280X in 1080p/1440p.
Aside from that you're going to be GPU bound 99.9% of the time in actual gaming.
I'm actually CPU bound most of the time trying to maintain framerates in the 100-200fps region. Plus all of the RTS, MMO games out there plus a few others like heroes of the storm, kerbal space program etc are very heavy hitters and usually drop very low with lots of stuff going on.
No sense complaining about lack of performance improvements from a CPU upgrade if you're playing a game + resolution + settings combo that your GPU will limit you on, just upgrade your GPU instead if that's all you play.
If the site has bad numbers, fair enough. There's plenty of others showing the ~7-13% IPC improvements, it seems to clock better than haswell by a notable margin and the x264 numbers i know are correct.
Asus said that 4.7ghz with 1.32v was the best CPU they have seen(@hardocp), add to this the fact that these are all ES processors which are always far better overclockers then retail versions, my conclusion is that retail Skylakes you'll be happy if you reach 4.6ghz. Haswell ES sent to media went 5.0ghz easy.
This was discussed already in the big Skylake review thread. The information is inaccurate since Skylake is apparently limited by the 2133 MHz DDR4 reviewers, including Anandtech, used. Also potentially immature software on earlier reviews according to the Tweaktown review's author.
The Polish site Cyro is referencing above (showing the 6700K being superior across many games) used higher-clocked 2666 MHz DDR4. Tweaktown did too to also get superior results with the 6700K:
As always, these benchmarks in no way represent real-world gameplay. These are all run at very low resolutions to try our best to remove the video card as a bottleneck. I will not hesitate to say that anyone spouting these types of framerate measurements as a true gameplay measuring tool in today’s climate is not servicing your needs or telling you the real truth.