I'd still like to see it, along with a slightly more tame OC (maybe 4.8) on the 8600K, they hit 91C running at that speed. I'm not comfortable running that hot.
Though in the end, we get a good enough idea. It should be a pretty much a dead heat in the fully parallel multimedia stuff, with clear wins for 8600K most other places, making the 8600K a clear winner. I have no problem with the small price premium for the 8600K, but the MB premium is harder to take (they are about $100 CDN more around here for a Z270 vs B350). I miss the old days when there were independent chipset makers to keep Intel from gouging on that front.
Well the Z series motherboards are the 'premium' line, a better comparison would be to compare the Z270 to X370 as they are both the top end chipsets.
Granted, we don't have the H and B series chipsets for CFL yet, so for now, we are stuck with Z370 and rather expensive motherboards. This will affect the budget buyers more, for example a $120 i3 8100 coupled with a $150 - $200 Z370 motherboard makes little sense. I doubt the 8700K users will care that much though, if you are overclocking the Z based motherboards are pretty much the de facto standard if you want to achieve maximum overclocks and performance.
In saying that, often H series mobos have tweaked BIOSes that enable overclocking, so budget conscious buyers are probably better served waiting a few months for those mobos to come out.
I won a H97 mobo a few years back in a competition and it overclocked surprisingly well, got my G3258 to 4.5GHz without a sweat, even popped in my friends 4770K to compare how it would overclock compared to his Z87 mobo and the final overclock was only 100MHz less, I got to 4.7GHz stable and he was 4.8GHz stable on his own rig.