Based on the first post, quoted below, Skylake only would be keeping with the intent of the thread. The DDR4 architecture is the only common link between X99 and Skylake. There is no comparison value as far as what may be optimal regarding obtainable speeds, timings or performance across the two platforms.
Originally Posted by Silent Scone
This threads main purpose is to both discuss information and various results and to gauge what is possible between different configurations, DIMM capabilities and CPU samples. Results are welcome all the way up the frequency spectrum. If it's obtainable, it should be posted!