That's good, because I don't have even a single photo of a duck for sale[1]. Seriously though, the whole thread is counter-productive. One can take good photos with bad gear and bad photos with good gear- while there are some "suitable for your environment and subject" issues, there are counter-arguments about time, patience, skills and practice that counter them handily[2].
Oddly enough I remember that I used to often encounter someone who often showed me horrendous images of ducks. He'd proudly show me 8x10 prints that, had I taken of them that I'd either have deleted, or never printed. He was happy with them, and proud of them- to him they were a successful outcome and rationale to shoot regularly[3].
As another thread this week shows, it doesn't matter what equipment you use, you can get good or bad results with all sorts of equipment, so other than brand championing (of which there's already enough in this fora to build several marketing department's worth,) I ask, what difference does it make?
Paul
[1] I've got Geese photos on my site, but nary a single duck.
[2] I've shot birds with 4x5 and 5x7 view cameras.
[3] I've seen lots of great bird images shot with much of the exact same equipment.