You are fortunate to have heard such great pianists.The only great one i have actually heard live was Ashkenazy,at a high school auditorium, back in the 70's when he was stillon a leash held by USSR.
Richter said he greatly preferred Haydn to Mozart, so you are in good company. Angela Hewitt, Arrau, and Brendel are my favorites too.
I have a video of Brendel, "Man and Mask" BBC (2000). Post concert in London there is a long line of beautiful bejeweled women patiently waiting for his autograph, hoping for a word from the man. Shades of Mick Jagger.He played his last recital in 2008 (age 77), but his lecture/discussion/demonstrations continued, and are so excellent, in both content and tone.Love that soft refined Viennese accent.
Alfred Brendel 2018 lecture about Beethoven last period, here:
https://www.youtube.com/watch?v=XFgfRZXsYVQ
https://www.theatlantic.com/entertainment/archive/2018/08/the-writer-who-makes-perfect-sense-of-clas...