I own one camera, a Canon A-1, which can meter up to ASA 12800. I got curious so I put a roll of Ilford Delta 3200 in and pushed it to 12500. Here are a trio of sample shots, for public viewing / review / general info. When I asked for samples prior to my own attempt I got none, so now here are three, for inquiring minds of the future. 
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These were developed in D-76 and the negatives scanned with a Nikon Coolscan 5000ED. As expected, grainy, but the fact that there was an image at all at this ridiculous speed is simply amazing. It won't be my last roll at this speed, that's for sure.


and

and

These were developed in D-76 and the negatives scanned with a Nikon Coolscan 5000ED. As expected, grainy, but the fact that there was an image at all at this ridiculous speed is simply amazing. It won't be my last roll at this speed, that's for sure.