This example compares the Voigtlander Ultron 40/2 to the Zeiss ZF 35/2 Distagon. Because the focal lengths are significantly different, conclusions must be inferred by overall image inspection, accounting for the difference in magnification.
Focus was matched as closely as possible. Out-of-focus areas are more magnified/blurred at 40mm than at 35mm, and have less apparent depth of field.
Depth of field is limited wide open of course, but overall image quality is very pleasing. Click images to see larger versions at f/2 and f/8 for both lenses. You can also compare the two images at f/8 via a rollover (mouse-over).
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Nikon D3 + Voigtlander Ultron 40/2 @ f/2