Thanks, Arash.
BTW, which Nikon body?
I have never done such tests. I have zero faith in comparative tests like this one. I do not trust them because there are so many variables. Not to mention, that as with statistics, the folks conducting the tests can often arrange to get the results that they want. I would expect that most decent prime lenses would be marginally sharper than most zoom lenses.
While I am sure that it is fun photographing five-dollar bills, I prefer birds. Here is an unsharpened 100% crop (at 1920 pixels) of an image made with the S0NY 200-600 AT 273mm. As you noted, one cannot zoom out with fixed focal length lenses like the 500 PF.
Before either of us comments on the image quality, let's see what others have to say.
I will post the optimized image below.
with love, artie