All just my personal opinion
Beethoven: Piano Sonata No.32 in C minor, op.111 — Comparing recordings with the following artists: Wilhelm Backhaus (1961), Paul Badura-Skoda (1969), Daniel Barenboim (1984), Ronald Brautigam (2008), Friedrich Gulda (1967), Julius Katchen (1968), Wilhelm Kempff (1964), Igor Levit (2013), Maurizio Pollini (1976), András Schiff (2012), Artur Schnabel (1935)
Beethoven: Piano Sonata No.22 in F major, op.54 — comparing recordings with the following artists: Wilhelm Backhaus (1969), Paul Badura-Skoda (1969), Daniel Barenboim (1984), Ronald Brautigam (2007), Friedrich Gulda (1967), Maurizio Pollini (2003), Artur Schnabel (1935)
Beethoven, “Eroica”-Variations op.35, Comparing recordings with the following artists: Artur Schnabel (1938), Glenn Gould (1970), Svjatoslav Richter (1970), Emil Gilels (1980), Konstantin Scherbakov (1984), Alfred Brendel (1985), Olli Mustonen (1993), Ronald Brautigam (2010)