Yes, I did, GC1 sounds very nice, but C2 sounds even better, richer to my ear.
Perhaps we may not be communicating. Of course a C2 will sound better than any kind of C1, whether it's a GC1 or a C1 or at the bottom, a GB1--it has the huge advantage of another 5" (or 8") in length. I think that's probably a given.
The issue is how much better does a C1 sound than a GC1, or a C2 vs. a GC2. Your comment below makes it clear that you didn't have the chance to check out those differences because of what your dealer does and does not carry. His or her logic as you've described it makes a kind of sense to me--at least regarding the C2, especially after considering Chris Venable's comments about the significant differences between the two series.
You may have seen my post above in which I remembered that I actually did (at least for a moment) get to play a GC2 once (and move back and forth between the GC2 and the C2). Despite a dealer's comments (and Larry Fine's) to the contrary, I found the C2 to sound far more polished and noticeably better than the GC2--at least to my ear. This too fits with Chris's comments in his post above.
The store that I went, do not stock on GC2, and C1. The reason that the consultant explained to me was: if a buy is interested in a 5'3", they think there is little difference in sound quality between gc1 and c1, and buyer is probably more budget consious, so the buyer will mostly likely choose gc1 over c1, I think it is partially from their sales experience. However if the buy is willing to invest more into a bigger piano 5'8", it is likely they will just go "all the way" and get C2, or C3, instead of GC2. That was certainly my mentality, but unfortunately C2 turns out to be too expensive for me.
Are you in the market for a piano? If so, what do you think you'll get--do you know? If you love C2s and don't need a "silent" version (near impossible to find used in North America), might you look for a used C2? Yamahas last a long time. I never would have gotten a new one except for the need for the silent feature paired with the inability to find a used one--I really hunted!
. . . the consultant told me the sound board used in C2 is better than GC2.
Well, Chris really knows Yamahas and he didn't mention that difference, so I wonder whether that's really so. I'd like to believe it though, having paid the extra money for the C2. (Again, I had no choice because of the need for the "silent" version, which is not available south of the border in GC2 form.)
. In short, sorry, I didn't get to hear GC2 side by side with a C2.
. But C2 is a beautiful beautiful piano.
I've had mine new silent C2 for 6 weeks now. The acoustic part of a silent C3 sounds even noticeably better, but it would have been too big for the space, too loud for the space, and too much for my budget. I'm very happy with my C2. The irony is my teacher has me working on a bunch of exercises that I just can't subject my neighbors below and to each side to. (I'm in an apartment house converted to condos.) Therefore, I'm literally spending more time with the headphones than the real piano. (BTW, the digital component of all the silent Yamaha grands is the same, so what I'm hearing through the headphones is exactly what I would have heard if I had spent twice as much on a silent C7.) I wish it weren't so, as I MUCH prefer the real piano!