Parts of SF are more expensive than LA. But are you talking LA or
the LA area, like Bel Air, Santa Monica, or the OC, like Newport.
It all depends on what you're looking for and where in SF you want to live
Comparing LA to SF, well, it's like Watermelons to Grapes. SF is like
a small Manhattan, but much more beautiful and a lot cleaner.
Like in NY, you can get around SF without a car. No way you can do that in LA -
SF is "neighborhoodie" like Manhattan - different parts of the city will offer you different things.