Just to try to drag the thread back on-topic, here are my favorites in each row:
5c (d had less noise, but seemed oversmoothed)
6d (d had less noise and seemed "sharp enough", but I get the feeling that if there were more detail it would have looked oversmoothed)
I want to thank the OP for making this comparison, and would be curious to see more of the same. I know a few issues have been pointed out in the thread, and a second pass might be even better.
If I had the time, what I would do is download the raw files of a standard scene from somewhere (I thought dpreview posted them somewhere, but either I am misremembering, bad at searching, or they took them down when they added their scene comparison widget) and convert them yourself using lightroom with the same settings, except scaled so that the image sizes are the same for the different cameras. You can even keep them as tiffs until final conversion to keep everyone (less un-)happy.
Oh, and how about a less inflammatory title for the next thread? : o )