YES JD-800 has it's own sound. It doesn't really sound like JV-1080 (had one), nor the V-synth. Though the V can be made to emulate it a little the JD has a much meatier sounding filter (and thicker sounding oscs imo).
I have a JD-800 V-Synth project with all the original ROM wavs, and have made some similar patches before - but it's just not the same as the real JD which has something else going on in the top/bottom end and poss the outputs/op-amps!
And of course it's beautiful. Looks wise, JD-800 is like the Lamborghini of synthesizers! I even had a dream once that I was driving it like a supercar?? don't ask!
V-synth is almost as easy to program though (if not easier in some respects) but the only synth that made me consider selling my JD-800 was the V-synth, as I believe it can technically do everything any other Digital Roland can if you know how, but it doesn't have quite the same character, feel or presence (and for sure the filters are different!). So really they can both live together. Mine do (for now).
I started a thread on here JD-800 VS V-Synth which I'm sure would be of interest to a V owner contemplating a JD.viewtopic.php?f=18&t=72683&start=15
also my post over at gearslutz http://www.gearslutz.com/board/electron ... synth.html