awagner,
Love to hear your thoughts re: comparing it with your F-512 and even the F-612. Out of curiosity, are the braces on the JF-100-12 straight, shaved, or scalloped?
Don't know about the braces. I'll take a look at the next string change.
I haven't come up with a description of how the JF100-12 sounds compared to the other 12s in my stable yet. It sounds great to my ear, but it does not have a unique sound that I can easily describe (at least not yet). I personally think it is the most attractive guitar I own.
The F512 has a perfect warm, dark rosewood tone, and the F612 is like the F512 in an echo chamber. So much depth, sustain and presence, it really needs to be heard to be believed. A little more difficult to play due to its long scale length, but not too bad. I prefer not to capo it due to a loss of sustain when I do.
The F412 is completely different, however. Bright, very loud and clear. One of my favorites, actually. The only guitar I ever sold was my Corona F412, which was very well built but chimey and tinny to my ear. Completely different from its replacement, which is in a class by itself.
My overall favorite, however, is the D80-12. It plays like a 6 string, and its sound quality is only surpassed by the F612. Not too hard to look at, either.