Someone who claims to be a Covid statistician and has a high opinion of his empirical ability is going around Quora posting Superman feat debunking threads (He also cites 30+ years reading Thor, so is likely a Thorbag)
But his stuff is interesting. This one seems fair:
This one I haven't read, but it claims to debunk his "unlimited strength" hype:
https://comicbookdebunking.quora.com/Superman-Does-Not-Have-Unlimited-Strength
And as an example of a non debunk thread to gauge his fairness, here is his assessment of Strange Visitor Superman.
https://www.quora.com/How-powerful-is-Strange-Visitor-Superman-and-what-are-his-best-feats
Here's the entire debunking library:
https://comicbookdebunking.quora.com
.
Something for Darksaint or another booster to go through, there is a LOT here.
I wanted to post the one where Superboy Prime vs Mxy is challenged, but can't find it. Maybe another poster did it or maybe it's mixed in somewhere (Hinged on the well known alt Zatanna, which entirely glosses over the fact Superboy Prime still terrorized someone powerful enough to affect Mxy)