I've played a CN33 in a store. At first I didn't like it. The tones of the pianos sounded a bit artificial, almost like an EP, in the octave below middle C. Then the salesman came up and played a demo, but the first thing he did was turn the volume up from about one-quarter I had it on, up to half to two-thirds. The difference in tone was amazing and I couldn't believe it. Even pianissimo parts. The sound(s) were very good on the first two pianos of the first two piano selections. (There are 4 sounds on each of the two piano options). The speakers and sound system seemed excellent.
The salesman left me to myself and I turned the volume down again since my playing is not so hot, and again I thought the tone is not so good on a low volume. Not just quieter but it seems to lose the clarity, sharpness, brightness; it might just be my old ears.
I also tried headphones. The tone through a headphone matches the tone with the volume turned up without the headphone, if that makes sense.
In the end I liked it. I wanted to play more. The playability, of the keyboard is excellent. I swear it actually improved some difficult arpeggios in a piece I've been learning, my fingers just found the combo I needed. I had a 'wow' moment in the store, like when you're learning a new piece and the you go from HS to HT and it just happens.
I am going to go back again later this week for another trial. Might take my wallet. :-) or should that be :-(