If I had never heard the second movement before, I would just assume it was a slow movement from Beethoven Op. 18. Its amazing to hear the qualities in Haydn’s music that influenced early Beethoven.
There's an article by Mark Anson-Cartwright called Haydn's Hidden Homage to Mozart: Echoes of "Voi che sapete" in Opus 64, No. 3". Thank you for your commentary!