There is a conductivity chart that measures occ copper as 100, silver being 103ish, and silver with 1% gold at 97 I believe, and as more gold is added, it goes down. I'm making an assumption that the 'micro' details will be lost, something like when you say 'visceral,' or hear 'realism' but these are just examples, not saying silver/gold loses realism or anything.
Just FYI for all you in the Canadian demo tour, the demo 1Plus2 pair is heading my way as we speak, probably in a stack somewhere in YVR customs. I'll probably receive it this Thursday or Friday.