I’m sure Zillow struggles with the high end areas due to the diversity of properties and typically lower volume of sales history.
That’s not to say it’s completely accurate with home values in fairly homogenous tracts either. Just that clearly that’s an easier problem.
As far as personal observations are concerned, that seems equally difficult for places like La Jolla and RSF, but I’m sure some have a much better feel for it than others.
On the earlier post, let’s hope nobody’s confused CV with LJ. It’s certainly on the ladder to it, but a rung or two (or 3?) below it (s’pose it depends on the size of the ladder…)