Clark gets shunted into the 616 Marvel Universe by a cosmic force and is unable to return to the DCU.
What do you see as his new role on this Earth? Which characters become his greatest friends/allies and which villains become his greatest enemies?
Would Superman be a good fit for the Fantastic Four/Fantastic Five?
Some fights for Superman in the MU: (not a gauntlet)
Fin Fang Foom
Ultron (adamantium body)
Well, take him on and win anyway. The Sentry, Silver Surfer (Maybe, although probably not.), Molecule Man, the original Beyonder, Black Bolt if he uses his voice, and a few others are really the only contenders. I believe there's a little bit of Superman in Spider-Man. And there are certainly Superman like characters at Marvel. In fact, during Reginald Hudlin's run on Spider-Man, I recall that he had a character who was literally a duplicate of Superman. He worked at a newspaper, and had his same power set. Really, I think the Marvel Universe would be a different experience for him, as the characters are more "human". If that makes sense. Imagine if Superman's arch enemy was Norman Osborn. Or the Kingpin. I believe that the Kingpin can one-up Lex Luthor. He's the type to really pull the strings enough to screw up Superman's life. I wouldn't mind Supes at Marvel, but to answer your question, I doubt it would be much different.