One of the most interesting threads!

Using very tiny and battered netbook speakers, 3 and 5 caught my ear. 1,2,3 sounded too bright, almost harpsichord like
3 and 5 were a little darker
Always the bozo, I didn't realize there was a 6th piano, an i missed it.

With headphones, almost the same, though 1,2,3 became more full bodied
6 sounded weird to me, like it was a little out of tune, like old real piano.

I remember many many years ago someone here had posted a website full of sound samples from different pianos.