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I used a D3x with a 50mm mainly. Great to use, very good pictures. But too big.
How would you compare the pictures from A7r and D3x ? In terms of colors especially ?
That's a good question and I can't give you an answer yet.
To explain why; all my accessories are centered around Nikon's D3 series (I have both the D3s and D3x) including strobes. The D3x's primary purpose is for artwork reproduction and was acquired for its accurate color rendering.
To get color temperature accuracy it is necessary to run the NEF files through Capture NX2 and from there to Photoshop in TIFF format. Adobe's "Camera RAW" seems to do something which is not acceptable to curators or artists.
With the ARW files I've used a RAW converter (at the moment I'm can't remember which one) that creates NEF files and ran them through Capture NX2, the results appeared much better. Sony's "Image Data Converter" is one I'm still struggling with and Capture One 7 is too subjective. In all fairness the only way to be sure is to shoot color charts under controlled lighting and measure the final output with a colorimeter. Something I plan to do in the next couple of weeks.
As a point of note; I did not acquire the A7r as a replacement of the D3x, but as a "walkabout" camera. However, to date the results have been surprisingly good. Notwithstanding its shortcomings if color reproduction turns out to be similar to the D3x, my right wrist and forearm will be even more grateful