Here in N. Florida/S. Georgia we had an absolute low of around 20, with two or three days where temperatures remained below freezing until around midday.
Out in the country, we lost a Meyer lemon. Although it was protected by frost cloth over a frame, it had suffered limb breakage prior to the freeze, which I believe can significantly decrease cold tolerance by stimulating the tree. With similar protection, we had some trees defoliate (pummelos, a Lakeland limequat, a Duncan grapefruit, and, surprisingly, a Ponkan). A neighbor lost an unprotected grapefruit on Swingle that had just been planted. Unprotected satsumas did fine, and an unprotected Ponkan graft I had high-grafted just a few months prior came through unscathed.
In town, the recorded temperatures were about the same, but it's hard to know exactly what temperatures were around my house, everything in ground survived. There was some defoliation seen on a Shiranui/Dekopon (on Swingle) and a Rhode Red Valencia (Trifoliate). A Flame Grapefruit and Ponkan (both Swingle) came through pretty well. In an unheated and partially open house (three walls and roof), lemons (Sanbokan, Lisbon, Harvey, Meyer, Ponderosa), limes (Kaffir, Persian, Lakeland Limequat), and various other plants (several mandarins, a pummelo, etc...) did fine - one of the lemons lost some new growth it was pushing out prematurely, but that is about it. Almost all have set fruit. Again, it's hard to know exactly how cold it got, but a mango and some pineapples in the same house died. Another mango (~2" trunk diameter) died back almost to the graft, but has since come back.
All trees are 1-3 years old except one 20 year old grapefruit that was unprotected and defoliated but has since come back and several older satsumas, which were also unprotected and did fine.