Man, that piano sounds great!
I'm listening through a cheap pair of Sennheiser headphones and it already sounds amazing, can't wait to listen to these clips at the studio.
Overall I like the sound of mic 1 better, it just seems to sounds a little more open, a little clearer than the other 2, the dynamics of the playing come through a bit better, the sound just seems a bit wider. If I had to pick just one I would definitely pick that one.
However, I really like the way mic 2 sounds on the calmer parts, in the second clip, it really gives an intimate vibe to that part of the piece and it fits the music.
Mic 3 sounds cool too, and I'm sure in a denser mix it would sound quite good but since this is a solo piano recording, it doesn't have enough presence for my taste. Maybe placed closer to the piano they would've sounded excellent, but like you said this is a comparison, not a scientific shootout and in this application, with this mic placement, mic3 just does not cut it.