I'm not sure if I'm understanding you, but are you implying that you don't actually play the Moonlight well? I think it's silly to make the assumption that you can play the sonata well if you can't.To me, assuming you could play Beethoven's Op. 27 No. 2 well to a fine standard assumes so much in terms of pianistic ability and skill. I only know a few people that can play a Beethoven sonata very well. These people are world class musicians. I've yet to meet someone who can play a Beethoven sonata well that's not a world class musician.Anyway, if I were to make this assumption and you asked me what to learn next, I would say whatever you like the most.
If you have the technique for 27.2, you have the technique for basically all (if not simply all) of Beethoven's sonatas before that one, and a good deal of the later ones as well.
What? Even Op. 2 no. 2, Op. 2 no. 3, Op. 7, Op. 10 no. 3, Op. 22, Op. 26, and Op. 27 no. 1? I would say all of those are much harder than the moonlight.
What? Even Op. 2 no. 2, Op. 2 no. 3, Op. 7, Op. 10 no. 3, Op. 22, Op. 26, and Op. 27 no. 1? I would say all of those are much harder than the Moonlight.