I got my 7D2 and 5D3 at about the same time. I don't have much experience yet with high ISO shots. I took the photo below with the 7D2, 100-400 II @ 105, f/6.3, 1/160, ISO 6400, handheld. When I first imported it into Lightroom, it was pretty grainy. But after applying some color and luminance noise suppression, the photo seemed to get much better. I'm still not sure if the noise level puts it in the "keeper" category or not. For those of you that do have experience with high ISO, is this shot ok? Thanks!