Nikon announced their top-of-the-line DSLR recently. The 4K video equipped D5 camera claimed it can shoot at ISO 3.28 million. Of course, this is to chase (at least on paper) the remarkable Canon ME20F-SH camera that can see in the dark and shoot at over ISO 4 million plus. By the way, if you want to see how good the Nikon D5 shoots in 4K video, click on this post.
Canon is expected to announce their EOS-1D X Mark II camera next month. You can see a comparison between the Nikon and the highly anticipated Canon camera here.
See what shooting with the Nikon D5 at ISO 409600 and 3280000 look like in the photos below. Frankly, I am embarrassed to even show the images. Both photos are grainier than looking into a salt shaker. No one single number can make one piece of equipment superior to all the rest.
In my opinion, in wildlife photography, a weather sealed camera with a full frame, mid 20MP sensor that can shoot in native ISO 12800 with little noise, an advanced AF system with all cross-type 75 focus points and 12 AF points @ f/8, plus a burst rate of 12 fps is adequate. Anything more than that is expensive hype. After all, the most important criterion for a successful shoot is - luck, skill and equipment, in that order. You can see my equipment bag and works on MichaelDanielHo.com