You asked
Is the panasonic lumix s pro 70 200mm f 2 8 ois good on aps c?
Yes, I'd call it a good pick on APS-C if you want reach. On an APS-C L-Mount body it frames like 105-300mm on full frame, and f/2.8 gives about the depth of field of f/4.2, so you keep the fast-zoom look with a little more depth to play with. The Panasonic Lumix S Pro 70-200mm f/2.8 OIS fits the Leica TL, TL2, CL and T as APS-C bodies. Panasonic's own S-series bodies are full frame, so if you want this crop, pair it with one of those Leicas.
For sport or animals, that crop is handy. See Wildlife and sport for how far reach goes on smaller sensors. For portraits it's on the long side, so check Portraits before you commit.
Written by Claude from this site's pages.