There’s a lot of east Asian literature that has some explicit Buddhist content (cultural rather than dogmatic) and a genuinely Buddhist sensibility. The parade example is The Tale of Genji (Arthur Waley translation, here as in his abridgement of Journey to the West, "Monkey " has the highest literary quality of any English rendering. )
Buddhist SF I have not seen, though I think a lot of Mahayana sutras are close. (Lankavatara Sutra especially. )
Though it’s poetry, not fiction, Ginsberg is probably the finest Buddhist author in English. His late book White Shroud is particularly fine.
Kipling’s autobiographical novel Kim has, along with the finest description of street life in 19th century India, a Buddhist monk as major character and hero.
Excellent point regarding Kim, Jake. In addition to what you say, it’s worth noting that it is a cracking read to boot. The portrayal of that monk (can’t remember his name!) is very powerful as well - of all the story, that probably left the deepest impression on me.
Kipling was deeply moved by the Buddhist piety he saw in Burma. Whilst it doesn’t have a thing to do with Buddhism, his poem “Mandalay” is, I think, one of his finest - very evocative and beautifully phrased.
