Considering the high ISO used, I think these shots are amazing!
The shots at 12,800 and 25,600 look as smooth and good as many SLR's at 400-800 ISO.
Looks like you'll be able to get a good shot of a black cat in a coal bin at midnight, without flash!
No wonder the 5D3 doesn't have a built-in flash.
It would rarely need one!