We don't know any sort of performance, however I do expect SKL-X to be better than TR (high core count with low clocks isn't everything in MTA
).
Turbo 3 is for single cores performance and turbo 2.0 scales with number of active cores. I don't see the 10 core or 12 core intel chip getting over 4.1~ GHZ on all cores without at the minimum an AIO and some overclocking (don't think turbo will be enough), potentially even a custom looop.
Threadripper is two 1800x fused/stiched together it probably has the same overclocking limitations, A.K.A 4 GHz being the limit.
However considering that these are aimed at professionals overclocking is not a high priority. It will be the base clock that is most important and going by the 7820k i don't think intel has much of an advantage. If memory serves me right at the same frequency ryzen has been shown to be better at multi threading than equivalent intel with the same core count.
To summarise I don't think the top range SKL-X will get past 4.1~ GHz without an all in one. It could potentially make it to 4.5/4.6 using a custom loop but that doesn't matter as these will be going into workstations. SKL and threadripper will probably have the around the same base clock speeds for a given core count. Therefore i think your statement is wrong, TR will be better than SKL-X in MTA (No point having higher clocks if you can't maintain it at full throttle
).
Side point: I think intels marketing is going to be based heavily on the turbo 3.0 figures, potentially to fool/mislead people who don't understand how turbo 3.0 works and may think that it will work for all cores. (It makes the most sense from a marketing stand point).