Akira, Fuji need to come up with a 200mm fastish lens, f2 would be fine! The big zooms you are suggesting are a bit unwieldy, hence the request for a physically small long lens, something like a CSC compatible Nikon 300mm, f4 PF lens would be spiffing. But according to the Fuji for we spoke wasn't very optimistic!
Sten, absolutely right.