I'm viewing my ISO 6400 5D2 shots at 47" 1080p (from several feet) and 24.1" 1920p (up close) with no issues at all. A 5"x7" should be a piece of cake. Same for the 7D for everything up to ISO 800 with some successful shots at ISO 1600.
I haven't quite figured out when the 7D works at 7D works at ISO 1600 and when it doesn't, but the failures are nasty. They're not just noisy, but the detail dissappears and some are almost cartoonish or like someone painted with a broad brush. On the bad shots, there's lots of contrast and the middle and dark areas get really messy, even with +1EV.
Dave
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