Don, I already did that. My Papa Joe shots were in pretty much exactly the same light as your cats. I referred you back to them again, but you had completely screwed up my thread posting images from photokina by littering it with arguments and promo pix from Canon and Nikon, and ignored these entirely. I hate to 'do a Sonolta' and post something repeatedly but here goes, repeated, between the dashed lines:
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Here is the Nikon D3, section of a 12 megapixel image shot at f5.6 and 1/125th using the 24-70mm at 24mm. Now it's not stunningly detailed even if the noise is very even, and the noise is not zero either. Processing conditions using ACR were 0 sharpening, 50 chroma, 0 luminance. The focus point in the shot is the copper cauldron. Checking many other shots, this degree of detail softening is typical of the Nikon at 3200:
Now look at a section of one of the shots I just posted, this time processed identically to the Nikon (the full image actually uses some luminance NR and sharpening 25 because it can take it, this omits the luminance NR and sharpening):

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The light level I shot the latest cat pix in is typical of many uses for 6400, and here is a comparison with the Nikon D3:
http://upload.pbase.com/image/103706023
For reference, a small version of the pair:
The illumination levels are within 1/3rd of a stop for these two shots. I just don't get where you are coming from. What are you trying to say, or prove? Absolute light level is not as important as relative exposure level, within certain limits, for getting a decent sharp result with moderate noise. I shot this pic mainly because I realised I didn't have any keeper shots which showed our cats doing their usual all-day stint getting the bedclothes furry, and when passing the light looked good. Your cat pix had reminded how few 'good' shots we have of our cats - once grown up, they stop being chased by the camera.
Within the limits of its ISO range - since it does not go beyond 6400 - the Alpha 900 is going to prove itself in the hands of users, no matter how much you jump up and down protesting that it won't and can't. You would not be advised to get an A900 anyway, except perhaps for your shots of graffiti and similar fine art copy/trouvé work - you benefit more from crop factor format shooting because of the distances involved, and the subjects really don't need 24.5 megapixels. Nor do a lot of mine, and I've decided that the A350 with CZ 16-80mm attached will be second string for 'walkabout' situations.
But, so far - the A900 will be used for high res AND for high ISO shooting. Apart from anything else it focuses much more accurately with my faster lenses (50mm f1.4, 28mm f2, 100mm f2.

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These are no doubt not the last 1600-6400 samples I will post, so I am sure further light conditions around the hand-held limit at 3200 will come up.
David