I have friends that live in Mission Hills and Kensington.
I think one of the reasons both areas are less “hot” than CV is schools. Mission Hills has the excellent public school of Grant Elementary – but not much for middle schools or high schools. My friends in Kensington send their daughter to a charter school because they were NOT going to send her to the default school.
Both neighborhoods are much more interesting than CV, IMO, if you remove the schools issue. Older, classic homes. Lots of character. Many of the high end homes back up to pocket canyons in both neighborhoods. Plus both have restaurants/shops and a walkability that is not present in CV.
A lot of people prefer newer construction, though. And that’s available in CV more than M.H. or Kensington.
In this market, though – school districts matter. Which is why CV is hotter than the neighborhoods you’re talking about.
(I’m less familiar with Coronado’s schools -so I left that out.)