See the woman in the third picture on the top row? The one in the purple (or pink, not really sure what colour that is) skirt with the big white bag in front of Sarah Jessica-Parker. I think her calves are more impressive than Sarah-Jessica's. I know some might say Sarah-Jessica's calves are more ripped, but that might be because she's jumping around in high heels in all the pictures, and while I'm not trying to take away from the fact that her calves are indeed muscular, let's face it though, any woman's calves will look ripped in high heels.
If you look at the unidentified woman in the purple skirt on the other hand, you'll see that her calves are not only bigger, but they appear to have quite a bit of definition on them, even though she's in flats. Can you imagine how they'd look if she wore high heels, or stood on her toes? And I totally agree about Kristin Davis. She's got killer calves, although I think you could have posted a more flattering picture of her. Kim Cattrall's got nice calves as well. They nice and thick, although they could do with a bit more muscle to make them look firmer.