Another reason why Nikon Df can be called as King of High ISO Performance:
Link: http://www.dpreview.com/previews/nikon-df/8
1. Increase the ISO to 25600
2. Move the area to be observed on the picture on nun admiring a painting on the left hand side
3. Now you can compare between Nikon Df vs Nikon D800 vs Nikon 610 vs Nikon D7100
(sorry to include D7100, because either D4 or D3s is not available for comparison)
4. Please make sure all are compared on the same base ISO, which is 25600
Who is the KING !
looks like the same performance as the D4 to me... no surprises there...