Originally posted by Serkevan
Did you notice any difference in actual shooting?
The MK2's accelerator chip seemed to deal with high ISO better (12800 and above) but I don't like any more "in camera" processing than absolutely necessary, especially when shooting raw. Ultimately it was the price difference between the two, used, when I made the switch. Stepping back "down" to the mark 1 freed up more money to throw towards the 150-450 that I bought at roughly the same time.
Both are excellent bodies but if I had to do it again? I'd take a lightly used mk1 over a new mk2, assuming a significant savings could be found.