If you're a Richter fan, I strongly recommend his notebooks [1], which are well edited and give many insights into him and into his perceptions of the artists of that era. The second half of the book consists of a chronological listing of concerts he played in and records he listened to and his evaluations of both.

[1] https://www.amazon.com/Sviatoslav-Richter-Conversations-Brun...

I second the recommendation for Richter's book, which is a fascinating look into the mind of a pianist who musicians pretty much unanimously consider to be the greatest of the 20th century:

https://www.amazon.com/Sviatoslav-Richter-Conversations-Brun...

(not an affiliate link)

Haydn's output is huge and varied. It can take time to find the right recordings and pieces to convince you, as sometimes interpretations can be a bit pedestrian. French pianist Jean-Efflam Bavouzet is in the process of recording all of Haydn's Piano Sonatas for British label Chandos Records, and the latest Volume (no. 7) is superb.

https://www.chandos.net/products/reviews/CHAN_10998