I've just finished Grant Morrison's Supergods. I have to admit that I've never been able to get into comics - oh, I've read a little Dredd, 40k, The Crow, Watchmen and the bad taste comedy of Lenore, but I've never stuck to anything. Most of my superhero lore, like with the mainstream, comes from the recent spate of movies.
If you haven't read it, it's one part history of comics and one part history of Grant Morrison. It also talks about comic books and superheroes in deeply psychological terms, which is what interests me.
After all, rpg characters are superheroes, regardless of genre.
Even Vampire, with its 'gothic storytelling' shtick had characters who represented ideas, who could punch through walls and live soap-opera lives of people who don't die unless they're written out.
And what does this have to do with FS? Well, FS consciously straddles reality and myth. As I keep saying, FS characters are the 1%: mythologised like movie stars, powerful as only feudal lords can be and with technologies that look like superpowers to the common folk.
Reading a book that dissects superheroes and the heroic myth can only be useful.