Lenstip has reviewed a copy https://www.lenstip.com/index.php?test=obiektywu&test_ob=540
Its resolution is comparable to the the 400mm DO II ± 1.4xTC. The AF is slower, both measured here and from other reports on the net. Some good images have been posted by someone who got an early copy https://www.dpreview.com/forums/post/61650731, http://www.pbase.com/lance_b/nikon_500_56pf
Clearly more plasticky but the lens is light. OK Canon, let us have something similar!
Its resolution is comparable to the the 400mm DO II ± 1.4xTC. The AF is slower, both measured here and from other reports on the net. Some good images have been posted by someone who got an early copy https://www.dpreview.com/forums/post/61650731, http://www.pbase.com/lance_b/nikon_500_56pf
Clearly more plasticky but the lens is light. OK Canon, let us have something similar!