Panthera is ok. Its more like Cherna with more enterable buildings. Its basically a big circle though so there is a lot of PvP action. Limited military spawns too so your bound to run into people if you go to the airfields located at N, S, E, and W. I played it over the weekend, had some good fights. Im still a Lingor fanboi though, I dont think Panthera is as good. Its also a lot smaller, you could run from one end to the other in an 20 minutes.
Im really looking forward to Cherna v2 though.