The 5DSR is by far the best 5D for cropping (given all the usual caveats of getting the best out of a high megapixel sensor and having decent light etc). The absence of an AA filter is very important for the IQ, but can cause problems as there is the danger of Moire on feathers, which has hit some of my shots. If you need to crop greatly, it is usually when the bird is far away and there is no danger of Moire at longer distances, and the 5DSR rules. For close ups where you don't have to crop and there is a greater chance of Moire, the 5DIV is more suitable.
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