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I kept having a feeling that files from my OMD "fall apart" too fast in the post-processing, I felt faster than ones from NEX, but never had enough time to do analysis. Do you happen to have something that would better illustrate this?
I have had a very similar experience and have come to my personal conclusion which is familiarity. When I return to the 5DMK2 files now, I get a sense that the files are not as robust. Yet a few hours later after working with them and having got back into familiar territory they are not lacking. It was myself that was lacking. Same with the ARW files of the Sony Nex. When first receiving the OM-D I imagined the files were not as robust, that was until I learnt their strengths and weaknesses which every maker has.
My conclusion is based on Raw files which I am guessing you are? As I could never imagine using jpeg's to post process as they are not designed for post processing in mind, as they are already processed, a bit akin to frying a medium stake, expecting it to come out rare?