I haven't seen the theatrical version in several years.

For as long as I've watched DVDs (started watching them in 2003 when a cousin gave my family a DVD Player) I have only watched the extended cut of Superman. In fact, I can't ever remember watching the original cut since the 90s when people used VHS tapes. I remember renting Superman 1 with Christopher Reeve on DVD for the first time at Blockbuster and it was the extended cut.

I know cause there was all these scenes that weren't in the original. Like Lois Lane as a little girl on the train seeing young highschool Clark outrun the train. Then Lois telling her mom what she saw and she doesn't believe her. And the scene where the guys with guns try to shoot Superman to death and he stops them easily. And of course the scene where Superman walks through Lex Luthor's traps before entering his secret hideout. I later bought it on DVD and it was still the same extended cut. Even the Bluray only has the extended 2 and a half hour cut. I am not even sure you can get the theatrical cut on DVD or Bluray. I can barely remember the theatrical cut.