I use a D800E and I've used it with our local HS football games. I use DX mode often in order to reduce the file sized that I get when shooting at full frame. One of the advantage in using the DX mode means that I don't need to crop it during post and amplify any noise when shooting at night.
@ approximately 16mp in DX mode, I still get plenty of resolution. Some of the RAW files can even be as high as 46mp in DX mode.
The unique feature that I like about the camera with the four (4) custom image areas that it offers when using my Nikon 28mm f1.8G lens are:
a. I get a 28mm full frame field of view (36 x24)
b. 33.6 mm FOV in 1.2x mode (30x20)
c. 42mm in DX or 1.5x mode (24x16)
d. The other image area is 5:4 mode (30x24)
This makes it a good walk-around lens to take landscapes or group photos. It may be a little hard to understand if you haven't tried it but I love this feature.