It will not work on your Sony Jan Anne, until someone out there makes a Nikon E to Sony E adapter ...
I'm familiar with the works of Roy Mangersnes, and know him personally too. I don't shoot wildlife of course, so my testing of the 200-500 tries instead to provide insights into the optical and mechanical workings of the lens.
His review adds two points of interest: are the blur circles less constrained at distance, and why were his images not equally deteriorated by excessive lens flare? True, he does mentions the propensity for flare in backlit conditions, but still managed to get acceptable picture quality.
The first issue, of the shape of blur circles being a function of focused distance is testable and I'll look into that. The second question, that of lens flare, being detrimental in some situations and only mildly annoying in others, might be less easy to solve by testing. The Arctic autumn sun is much less intense of course, so that might have changed the outcome. Here in my part of mainland Norway, there is no way I could avoid intense flare if sun rays struck the front element of the lens.
