I am also quite partial to this small sushi place in Zug:
http://www.asahi-sushi.ch/cont_e.html

I'm not impressed by Nooba, Yohji and such. Faux Japanese.

I haven't been to a lot of Japanese restaurants in Switzerland, as they tend to be overpriced for the quality they provide. I only go when the company foots the bill.

The one at the Renaissance Marriot is a much higher cut above the chain restaurants. Great for a business lunch or dinner. (Unfortunately, I don't recall the name.)

I have to say that Samurai gives me the west-coast Canada feel for Sushi that I crave... Albeit at Zurich fall-over prices. The quality and selection is great. The Samuri Sushi, the boat with a selection for 2 is divine.

Weststrasse 180, 8003 Zürich
+41-43-811-5678
www.samurai7.ch/de/