Overclocked 5800k/6800k performance?

I'm not finding anything sure on these ones. Even though I think I'll wait for Kaveri as it looks like it's going to be more of a leap than the one between Trinity and Richland I wanted to know how do these chips perform with a "wise" overclock on both the iGPU and the CPU, as especially the CPU at stock seems to be quite unimpressive, falling behind the i5s (of course) and even i3s, which I find...sad.