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Summilux 50, the M lens? I hope no one is expecting great things of this one on an a7r in terms of corner resolution even if it played nicely. Its MTF argue otherwise. It's not great shakes even at f5.6. You are being kind, Taylor. The image is near to worthless except for corner colour assessment maybe. The blurry OOF leaf litter looks the same as elsewhere.
Maybe I have the wrong one. Wide open it acts like a typical f1.4 lens, the kind that prompted Zeiss to make the mighty Otus.
I think you are thinking of older versions when saying it wide open acts like a typical f/1.4 lens. The current 50 Lux M is clearly different from a typical lens. That is wide open. When stopped down good typical f/1.4 lenses can be as good as long as we look at contrast and resolution only. The bokeh from the Lux is, in technical terms, neutral most of the time (meaning people often writes creamy and beautiful and smooth).
But, there is always a but, when I had the lens and used it with my Nex 5 the corners and borders weren't good. How the lens and the A7R will behave together seem to early to tell. A wait and see warning flag is at place.