Hi,
sorry, but I have no comparison. But since I know the sounds of the some of the other emulated synths I can confirm, that bristol is kinda cool - in fact that it emulates lots of synths. I use LINUX for my music and I have to state, that bristol only runs under linux and there is no windows port - but nevertheless, there are some linux live-cds which include bristol - so everyone may try it.
I was looking for a long time for patch samples and I'm happy to find them here...

--- In korg_mono-poly@yahoogroups.com , Florian Anwander <fanwander@...> wrote:
>
> Hello Harald,
>
> > The following person would like to join the korg_mono-poly group:
> > Email address: haraldmebus xxxxx@...
>
> Welcome to the MonoPoly-Group.
>
> > Comment from user:
> > I am a musician and use Bristol
> I have to admit that I first did not understand this sentence, and I had
> to search for "Korg AND Bristol" until I found
> http://bristol.sourceforge.net/.
> I had never heard about Bristol before, and it looks interesting. Do you
> have any 1:1 sound comparison to the "real" MonoPoly Some examples
>
> Florian
>