I did a quick test that basically consisted of me looking at the same scene on both PTS and live with the same in-game settings. Haven't made any videos, but it's in Elden Root near the wayshrine, standing on the stairs on the way to the crafting stations, but turned towards the wayshrine (in both cases the place is almost empty).
My specs
CPU: AMD R7 1700@3.775 GHz on all cores
RAM: 16GB DDR4-3200MHz CL16
GPU: AMD HD 7850 2GB (I know, time to upgrade, blame the crypto-miners)
Settings used


Here are my observations:
Live
FPS: ~42
CPU load: ~13% (with 1 core maxed out)
GPU load: ~60%
PTS
FPS: ~53
CPU load: ~25% (1 core still maxed out)
GPU load: ~75%
I used Process Explorer to see the load of individual threads. I also observed that while on live only 7 threads ever reach more than 1% load (which is about 15-20% of a single logical core on an 8 core CPU with SMT), on PTS there were at least 14 such threads (didn't count them, but all the ones visible in the window were over 1%).
Conclusion: noticeable improvement in hardware utilization, resulting in an FPS increase of about 25%, but I'm still CPU bottlenecked with a slightly overclocked high-end modern CPU and a potato graphics card at stock configuration, so there certainly still is a lot of room for improvement.