Neither have I and I've played all 10 hours of the trail on the S.
I also downloaded the Xbox One trial version and played it on the Series S and I can honestly say the graphics do look better (especially the ice, player close ups and crowd) on the Series S over the One version. The load times are not even close so the SSD makes a huge difference in that regard, plus there's the old menu lag on the One version, which is slow and annoying once you get used to how much quicker and smoother it runs on next-gen.
BTW-Did you play it on a 4K 120Hz TV? If not, then you are not getting the full Series X potential.