Hi Nanda,
Excellent tip thank you - I've been looking for yum cha in Zurich ever since I got here five years ago. I often asked Chinese people and they either shake their heads or laugh that I should suggest that such a thing could be had here.
I was always a big fan, and would often go for the traditional yum cha Sunday brunch, something I sorely miss.
I shall go this Sunday and check it out. The prices sound a bit steep - but as you said - no competition. I guess expecting trolley service would be too much? (to be fair I only know 1 place in London that does it with trolleys).
For American readers you may be assuming that I have somehow made a mistake because I haven't called it "dim sum" like you do. "dim sum" are the dishes which are eaten at "yum cha" which is the meal itself. If you are Swiss you are probably puzzled, since you probably have no idea what we are talking about. You can find a description of the term yum cha here:
http://en.wikipedia.org/wiki/Yum_cha
Here's a picture of my favourite dish:
Mark