The EOS 50D is a bit old by now but technically there is not a huge difference between the 15mp and 20mp sensor of the upcoming EOS 70D -> 15% in terms of picture height (PH).
Now if we moved to the 70D, we wouldn't be able to do a lot of retesting thus you would loose the framework for comparison to some degree.
Thus what is your preference ?
Now if we moved to the 70D, we wouldn't be able to do a lot of retesting thus you would loose the framework for comparison to some degree.
Thus what is your preference ?