"He That Hath Wings" could've been a great X-Men story about Angel and mutant angst, but it was written in 1938.
Man, I'd forgotten that was written by Ed Hamilton, but now that you mention it, it basically IS the Angel. In fact, I wonder if that story was somehow an inspiration. It probably is - of all the Marvel comics, the one that shows the most pulp science fiction influence was X-Men. You could see elements of SLAN and Jack Williamson.
I read that a while back in Asimov's YOUNG MUTANTS collection (at the time, I was crazy for X-Men and would read anything with mutants in the title), and I was surprised at how it was a deeply sensitive love story and not a tale of superheroic action.