The Superman origin story is the Superman story, period. That's why it gets retold over and over - if there's anything like an actual legend or folklore associated with Supes, it's the story about the rocket and adoption and growing up on a farm and going out into the world. It's John Henry and the steam drill; it's Robin Hood and the archery contest.
I disagree. Thousands of issues of DC comics, multiple movies, serials and tv episodes have nothing to so with Supes's origin.
Death of Batman's parents and radioactive spiders keep popping up, and of course define the characters, but aren't the entirety of the story.