If you are referring to the wildlife shots which point out the advantage of the greater reach with the same focal length lens by the DX sensor vs an FX sensor, it is a very scientific approach since it compares the images at the SIZE THEY WILL BE VIEWED. Too many people simply look at 100% crops without regard to the real life size that the picture will be viewed in. Full frame pictures have to be cropped significantly to be the same angle of view as a DX sensor. The review takes this into consideration when making comparisons.
Clearly, when you can control camera to subject distance, the FX cameras will still have advantages. I can't get that crazy Kingfisher to come any closer and pose for me, though.
As far as I know you can't take an (identical) shot with a D7200 and a D810, magnify the D810 by 1.53x and get the exact same shot (digital size).
They're both a different resolution to start with so even when the shot has a crop factor difference, the digital end result does not differ 1.5x. When I'm displaying both shots identical, I can never have applied a 1.5 magnification and get identical sized shots. Something needs to be scaled up or down to get that.
In the end when shooting the D810 FX mode, there's only a 1.25x difference. Even with an 800mm attached, the sharpness difference isn't what's shown there. If, I have a D7200 that's malfunctioning.
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