But I fail to see why anybody would prefer a a380 over, say, a D5000 nowadays.
Thats an easy one - lack of legacy lens selection. One of the great things about mounts today is their compatibility with great lens of the past 2 decades. Nikon's lack of inclusion of an internal AF motor severely limits the selection to only the newest AF-S lens which are far lesser quality to cost and far fewer in number and selection. I would certainly rather have a huge, full lens selection than HD Video capability.
If you fail to see this very fundamental difference, recheck your work. When you sell your customers those Nikons, make sure they know that they can only get AF-S lens (unless they dont mind being stuck in manual focus).
And we took some pictures at ISO 800 and well, guess what - tons of noise, easily visible even on the camera LCD. I can't imagine why anybody would waste money on that, sorry.
I'm also curious - you are certain there is a noticable difference between the noise performance of the Sonys and the competition, so can you peg which of those shots is the Sony? Can anybody here?