Of course in Los Angeles a sushi bar isn't just about food, it's food and entertainment. Pricing and quality must match the venue, of course, but much of success depends on the personality of the sushi chef(s).
Down the street a ways we had a super-popular sushi bar with a real cut-up of a chef. Unfortunately he ran off to Alaska with his Mexican dish washer leaving his wife holding the restaurant. She's still running it and it's doing well again but it was touch and go for a year or two.
Also famous on this side of the hill is the "Sushi Nazi". You sit down and he plunks a board in front of you and serves you sushi - what he's serving that day and in whatever order he's serving it, and everyone exactly the same. The only input you get is when to stop.