There are plenty of great mid-range restaurants in SF. I haven't been overly impressed with AQ, but if you are OK with that type of restaurant, there will probably be other alternatives and threads for "open on a Sunday" that you can search for.
As for Keiko, I wouldn't be able to judge your thoughts about the nature of the French influence. My suggestion would be to check out the online sample menu and form your own opinion.
http://www.keikoanobhill.com/menu/index.html
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