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Mostly games and 3D modelling/rendeirng plus a bit of photoshop.
The 6700k is probably overkill for games at the moment, since even with dual 780s I'm usually GPU limited at 7560x1440. Having said that the upgrade from Sandybridge to Skylake does apparently improve SLI performance, particularly in terms of minimum frame rates or 'stutter'. Am also hoping that since the 2600k lasted over five years it'll be about as future-proof as technology gets.
For the 3D stuff, rendering would definitely benefit from more than four cores (or more than one CPU) but practically everything else is still single threaded so overall clock speed is more beneficial. The likes of Xeons and Quadros are so expensive compared to the regular consumer stuff they've never appealed for my uses.
Brun-
The interesting thing is that your CPU is a tenth of the cost of one of my CPUs, and yet in terms of performance it's not far from what one of mine delivers.
The only real differences emerge in the bandwidth available to each CPU from RAM, and the ECC RAM support. But unless you're doing some incredible throughput and maxing it out, it's not going to make a difference. For the vast majority of workloads, because 3D rendering and even Photoshop would outsource some work to the GPU... you're actually going to see performance on par with my insane system.
This is why... when I finally do need to replace my machine, I'm unlikely to go back to a workstation class machine. I love my machine, but outside of the first 6 months of running a lot of VMs concurrently, it's just overkill and doesn't represent bang-for-buck.
Velocio
That's a beast of a machine... I missed it, but what are you going to do with this thing?
My desktop machine is actually starting to feel out of date. This is the HP z800 I purchased back in 2010. 6 years old and it is still doing fine, I've upgraded the GPU but that's about it.
Still has dual 2.8Ghz Xeon x5560 and I downgraded the RAM from 192GB to 24GB (to get back some of the cash I'd invested now I no longer needed to run 100 virtual machines concurrently).
The thing I still love about mine is the system board. The thing is insane, something about workstation class motherboards and the ridiculous bandwidth on the bus, combined with dual Xeons and the ECC RAM is just nuts when it comes to high bandwidth, high CPU intensive operations... such as encoding a Blu-Ray in about 3 minutes.
It's just a shame it sits there mostly idle and running Plex for 99.99% of the time. What a waste, oh the humanity.