Redlands, CA Zone 9b checking in here:
Last year, my
black sapote totally defoliated with winter, lost a ton of healthy growth, and looked dead. Thanks to the advice of folks here, I kept it, and it recovered, has survived this winter. Really doesn't like weather below 40F. I used much more aggressive covering this winter, most of the season, and only had one dead leaf. Hopefully it is tougher now.

Canistel, two years old, from seed. Doesn't seem to get fazed by the cold weather, but isn't very fast growing either.

Green Sapote, seedling, from Hawaii seller. It has survived two winters now, and keeps putting on growth. Still small but robust. MUCH better than the waste of money one I purchased on Mamey rootstock a few years ago, that one is now dead.

Lucuma, from seed. Growing robustly, kept growing during the winter, and looks the best out of my my sapotes. It's about 1.5 years old at this point, probably 20" tall?

I have many white sapote seedlings, and several trees in the ground. They did not seem to need any covering for the winter, and seem definitely suited for this climate. (Didn't include photos).
Keep the posts coming! And if someone has green sapote seeds available, let me know
