Interesting that Keats is at the top. I'm currently reading (and almost at the end of) Hyperion, and Keats plays a significant part of the story. One character proclaims Keats to be the purest poet to have lived.
Still, Hyperion and Fall of Hyperion is some of the best scifi I've read, and I say this despite not being a big fan of some of the themes Fall introduces.
You say you're almost done, so I assume you have read the soldier's tale by now:
> The Fall of Hyperion is narrated by the poet, who, in a dream, is allowed to enter a shrine. The goddess Moneta reveals to the dreamer that the function of the poet in the world is to separate himself from the mere dreamer and to enter into and embrace the suffering of humanity.
What makes him purer than Chaucer, or Rumi, or Homer, or Kalidasa?