I got to play a new 2014 814ce this past Friday, but didn't get to spend much time with it and really only got to compare it to a 314ce. It sounded really good, both acoustically and through a Fishman Loudbox Artist. Compared to the 314ce (which sounded pretty lackluster vs. the 324s that I've played), it was just more lively, more responsive, more open and just felt lighter. (That was probably quite an unfair comparison.) Compared to the 714ce (in my memory, which is not a fair comparison either) it sounded a bit more open with slightly more present mids, slightly more present and spongy bass, but with slightly less overtone content and less shimmer. I liked it, but there was that trade off. To get a looser, more open sound, with open even mids, the treble has to be less articulate with fewer overtones? I liked those overtones and zip of the 714ce and felt like I could dig in with those single note lines, but I liked the rounder bass and more present mids of the 814ce and automatically approached it with a more delicate touch. Did it come down to strings....all of those changes to bracing, glues, finish, etc.? I'm not sure. I will say that with the revoicing, the changes in tone were perceivable, but subtle to me.
Over the past few months, I've realized that I really like the spruce/rosewood combo in the Grand Auditorium size (which I think is one of the perfect Taylor combos) and I can tell you that I instantly knew that I liked the 814ce (though not enough to break out my wallet), whereas the 714ce took a bit to grow on me.
Once again, all of this is an unfair comparison, but the important point is that I finally got to play the latest version of the 814ce and thought that it sounded very good. Given time and playing could a pre-2014 814ce sound like a 2014 814ce? Maybe. Would I run out and buy one? Not any time soon, since I really love what I have, but I got to see that different isn't better. Different seems to be a trade off and not necessarily better or worse, but different.