(Not a scientific comparison between images taken at two different times under different conditions — but this reflects “actual use” conditions for me.)

(See related:  Nikon D810 vs. Leica M240 in “real life” use.)

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I photographed my kids’ school Fun Fair yesterday.

Here is an image from the event, taken with the D810 + Sigma 35mm 1.4 Art @ f/4:

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Here is an image from last year (2015), taken with the Leica M9 + Leica 35mm Summilux ASPH FLE @ f/4:

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… And here are the magnified views.

First, the D810 + Sigma 35mm f/1.4 Art @ f/4 (magnified):

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Next, the Leica M9 + Leica 35mm Summilux ASPH FLE @ f/4 (magnified):

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My conclusions:

The D810 + Sigma 35 Art made it easier to photograph the event, the M9 + Leica 35 FLE produced more pleasing image quality (in “actual use” conditions).

In all fairness to the D810 + Sigma 35 Art, when the conditions are right and the focus is nailed, this combination leaves very little to be desired: Nikon D810 + Sigma 35 Art in optimal conditions.

—Peter.