The about $2998 Panasonic Leica DG Elmarit 200mm f/2.8 on the about $1999 Olympus E-M1 Mark II worked great and is so tack sharp that color aliasing in the hair/fur becomes an issue.
See also the Pronghorn Antelope images from a few days ago.
Bighorn Sheep, particularly large males, can be difficult to approach. But this large group of about 20 mature males seemed to have little concern about my presence. I try hard to stay outside the comfort zone of wild animals, and the Panasonic 200/2.8 made that possible (equivalent to 400mm on full frame).
Now published in my review of the Panasonic Leica 200mm f/2.8 are full resolution images taken on the Olympus E-M1 Mark II.
Includes a large number of images up to full resolution.