I've been listening to Cyprien Katsaris' performances of Liszt's Beethoven transcriptions. They are really great. The scherzo movement of the ninth symphony may be my favourite. I'm kind of disappointed I didn't remember these existed earlier, although apparently I had downloaded them a couple of years ago and completely forgotten ever to listen to them. I did not realise this until I downloaded them again however. Apparently Liszt did a piano duo arrangement of the symphonies as well, although I haven't been able to find much on those.

I'm going to have to seek out more of Liszt's music.