Back on holiday with the Quads + Townshends + a more suitable amp, I've been indulging in old favorites: either ESLs convey the piano exceptionally well, or the Beethoven and Schubert sonatas (& the Diabellis) are just my idea of perfection. Or possibly both.
(I don't tend to think in cycles so much as individual performances - so Stephen Kovacevich for one, Fischer, Brendel, Lewis, Barenboim, Gulda, etc. etc. for others. Having heard some of them live no doubt introduces irrational bias.)