Liszt's original manuscript of the B minor sonata is available to download for Piano Street Gold members.
I checked it out, and I tell you: it is an amazing experience listening to the recording while reading Liszt's note scribbles. Somehow, the music makes so much more sense, following the original sheet music. It even includes Liszt's fingering and whole sections that were crossed out. Going through it really paints a picture of the man and makes him seem so much more human than legend.