The taxes and cost of living are similarly high in both places. All in all, if you can have the same salary in Switzerland, the different would really end up being more about lifestyle than about money.
Switzerland has vastly better public transportation and car ownership is more expensive.
San Francisco is close to the surf, Switzerland is close to the snow.
In both places, housing is expensive in the sense that people spend a large share of their income on it; construction is likely to be sturdier in Switzerland (concrete not wood frame).
Switzerland makes you pay for landfill garbage disposal by the bag and it's expensive, in California it's rolled into property tax and it's cheap.
Child rearing is expensive in both places.
The US has a strong pro immigrant policy, for example if your child is born in California they'll automatically be American regardless of your nationality or your spouse's. In Switzerland they won't get Swiss citizenship and you and they'll pretty much be considered alien in that land forever.
California is a huge state, part of a country thousands of miles across. In Switzerland, wherever you are you're less than 150 miles from a border with a foreign country.
These, not take home pay, would be the real differences.