I have, a long time ago (6th-form?), but only in translation — don't ask me which edition, whichever one was on my Mum's bookshelf — and (if I'm honest) pretty much only so that,
if anyone asked, late-teenage me would be able to say that I had, thus clearly demonstrating my intellectual superiority *hollow laughter*
(And my cunning plan has finally borne fruit, only 25-ish years later!)
Don't remember much about it either, TBH, likely because most of the Classical and Judeo-Christian references went swooshing a looong way over my head at the time (never studied Greek/Latin, raised atheist). Though
The Seven Basic Plots, which I just finished wading through (
that's a book which was in dire need of a ruthless editor — even more so than
Order of the Phoenix) helpfully provided a synopsis of it (several times

).
Do also vaguely remember starting Milton's
Paradise Lost a year or two afterward (possibly after having encountered Neil Gaiman's
Sandman comix at college), but don't remember ever finishing that one...