Chris, Jono, it's funny what we all notice.... i found the old M8 shutter not bad at all in comparison to the R-D1 (which deaf people can hear). then again, i didn't find the new shutter all that awesomely quiet which was a let-down for me. i had some romantic notion that it all of a sudden would be quite stealthy -- which it's not. i still think the wind is the most objectionable part in terms of the noise (the manual recocking on the R-D1 is so much nicer in this regard).
for people that constantly use the 8000 and have gotten used to the old shutter, well, that's all i'm saying. it's an awful lot of money for something that is still quite audible unless you need it to be as quiet as possible (like me).
as robert mentions, the new shutter feels quite sweet. the smoothness allowed me to hold still for the press longer, but i have an issue with my shutter finger and i wasn't sure if it was just me.
i'm saying this all as a delicate punter who played around with both. i would have the shutter upgrade and, along with the discreet shutter, it may be enough to turn me. i say "may" as i need to walk around my streets here to see if it's quiet enough.... it's really the biggest issue i have with my Epson. there have been quite a few shots i've missed because of the shutter (there really is something to the frequency that makes it pop).
the proof in the pudding for you all will be Terry's testing the two side by side, hopefully in real world situations.... so i'll shut up now.