Just sticking to LIVING and IN CONTINUITY characters IN THE SAME UNIVERSE as him…
A handful of Kryptonians have the base strength, practise with powers, and combat training to pull it off.
Wonder Woman could potentially pull it off - she’s slightly weaker, with lesser invulnerability, but also slightly faster, and MUCH better trained. I wouldn’t be willing to lay a bet, either way.
Sodam Yat could hand his ass to him. Most other GLs would fall into the same realm as Wondie, but Sodam has both his GL powers - and the boost of being Ion, to boot - and his Daxamite abilities (which are identical to the Kryptonian power set, save for a weakness vs lead, not Kryptonite - and the ring protects him from that).
A few other Daxamites might be able to, as well, but save Mon-El (who’s a scrawny, mostly pacifistic dude) and Yat, none of them are really practised with their powers.
Parasite is quite capable of both weakening Superman and strengthening himself to the point that he could do it.
A number of Superman’s major enemies fit in that same group - they use devices or powers to weaken him, and strengthen themselves (Luthor’s power suit, Metallo’s robotic body and Kryptonite heart, etc). (Others, like Prankster and Toyman generally go at the weaker civilians.)
Most of the New Gods - and, in fact, quite a few other deities.
Mongul (both father and son, but the kid’s currently got the added advantage of a Sinestro ring).
Any major league telepath or magic user is able to snap to his weaknesses, even without specifically depowering him with red solar radiation or Kryptonite.