Han I have found that a number of Japanese use a particular website to find good sushi restaurants outside Japan. I checked the listings for SFO and there are over 70. It usually has one or more reviews for each well known place. Although the reviews are mostly by non Japanese, and the site was set up by non Japanese, it appears to be quite popular in Japan as a way of finding sushi in foreign locations.I have attached the website link for you. I hope it works.