Is there any data on how Core Web Vitals/Page Experience has affected ranking so far?

So has been rolled out or is continuing to be rolled out but I haven't seen any data yet on what kind of difference this is making to people's rankings.

Has anyone begun to document the changes?

We lost ~30% of our traffic but I don't know if this just typical Google update misery or specifically because of Core Web Vitals, or just seasonal traffic loss.