This 2-way comparison demolishes the idea that a 50mm rangefinder lens is free from the damaging effects of ray angle, a fact shown 9 months ago in the 50/2 APO mosaic aperture series. But the A7R.MOD versus stock A7R can leave no doubt.
In Guide to Leica:
Includes HD images up to 4320 pixels across the f/2 - f/11 aperture range as well as HD crops from both the stock A7R and Kolarivision A7R.MOD can be easily compared. With commentary.
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