There are a lot of other Chinese neighborhoods in SF besides Chinatown, though. There are a great many Chinese people in the Richmond district and also in the Sunset, which even has a small Uighir community). Chinese people make up a much larger share of the population in SF than in LA, IMHO. And there's a lot of other Asian enclaves around the Bay Area. OTOH there are a lot more Korean people in LA than in the Bay.