Astner
The Ghost Who Walks
Superman Prime from the 853 century, after having gathered power in the sun for five millennia was revealed to have the last Green Lantern ring.
And he was defeated by the Deadly Sins.
Originally posted by Parmaniac
This version of Superman should be comparable to the variant you're outlining. He's not the only Green Lantern, but he's been in the Sun significantly longer than a
dip. Superman Prime is below universe level. We know this because the Seven Deadly Sins are universal, and because he was unable to save Atom's universe.
The best feat I can think of that would arguably scale in some fashion or another is Kal-Kent's and Titano were able to decelerate a moving galaxy with their Force Vision.
And while Superman Prime doesn't have Force Vision, and it's applicability in combat is highly questionable to begin with, Superman Prime is supposed to be more powerful than Kal-Kent. So I wouldn't push galaxy level feats beyond him.
So somewhere in-between galaxy to universe level should be fair.
Originally posted by Sin I AM
Those types of power ups detract from what Superman is. At his core he's as powerful as he needs to be.
This is a cop-out answer and can be applied to any character. Spider-man is likewise going to be as powerful as he needs to be for the story to be told the way the writer wants to tell it. But that doesn't change the fact that he has well-established limits, just like Superman.