http://www12.statcan.ca/english/cens...nority&Custom=
Stats Canada lists there being over 65,000 Chinese and over 70,000 South and Southeast Asians in Calgary as of 2006. In comparison, there was less than 5000 Japanese.
Assuming all Japanese Calgarians DON'T own sushi restaurants, there are likely more non-Japanese Asians owning these restaurants. I've heard Chinese being spoken in Japanese restaurants on more than a few occasions.