dcas said:Would Moorcock be among the "big four" of fantasy writers? (This is an honest question, not a rhetorical one, as I don't follow fantasy fiction.)
Maybe. Contrary to popular belief, Howard is not really among them simply because most people haven't read him (in many cases, even if they think they have). Plus, there's still debate as to whether he was actually any good or not. Even people who defend his work sometimes admit that it is not as polished as it might be and is not particularly nuanced.
Then you have Mervyn Peake, who was probably one of the most important writers of the fantastic ever, but whose work is extraordinarily difficult for many people to read. Part of the trouble with fantasy is that many things that are really interesting are not comforting or comfortable. The pathos is not going to lead you to the expected resolution or in the expected meter. Gene Wolfe deserves far more recognition then he gets. He's ben called the finest American author in any genre, but I doubt that many "fan" types have read him.
C.S Lewis and Tolkien? Definitely. J K Rowling is there too. These are primarily the result of sheer numbers and the popularity of a general set of themes. They are, after all, so popular that a mildly precocious 14 years old can get rich off of a fairly despirited pastiche of their work.
I'd add Roger Zelazny. Neil Gaiman is up there nowadays; he and Rowling are the most mainstream-friendly fantasy authors. I'd put Moorcock more on the line with Clive Barker.