I see; you're not looking for a discussion, but for one of those internet fights. It must be the Christmass spirit
First, I mentioned ephotozine only to show you that DXOMark is not the only site which found vignetting on a super tele (something you claimed it can't possibly happen). I would rather go with the DXOMark findings, unless you can present me good reasons not to (an extreme case of confirmation bias doesn't count). By the way, you should read this:
Vignetting - DxOMark
Oh, and since "We go to slrgears to check real tests at FF cameras ", eat this:
"At the heart of entire test process lies DxO Analyzer" How we test lenses - SLRgear.com!
Second, my entire point is that lenses like this Nikkor have measurable levels of vignetting in the extreme corners, but in practice they're not an issue - nobody will claim "this is not a FF lens, it vignettes too much". Yet said claim was made for the 560mm.
Third, Pentax just published an uncropped sample of said DA lens and a few others, taken with a K-1 prototype.