I finally set up my workstation and let me share my experience.
Lightroom is blazingly fast now with QYF8 (no overclocking) although I am still using same I/O devices (cheap Sata SSDs on RAID 0 via Adaptec ASR 71605 and Intel VROC). The only problem is memory. Lightroom crashed as 32GB memory was not enough for 56 cores; increased memory to 64GB and all is good. I am also running on 3 DIMMs, and probably the system is memory bound at this moment. Coming from 2x 2690v4; the difference is huge.
So far, didn't see any odd behavior. Even if there are bugs with these ES chips, nothing to impact Lightroom and Windows.
My only failed action is enabling bifurcation and I believe this is because of my HP Z Turbo Quad Pro card.