Photozone.de reviews the new Voigtlander 40mm f/2 pancake lens. I love Photozone lens reviews, they seem to really hit everything I want to know about a lens.

Resolution looks extremely nice:

At f/2 the resolution is already very high both in the center as well as the borders. At f/4 the center quality receives a boost into extreme resolution territories – it surely exceeds the sensor resolution here as well as at f/5.6. The border quality increases steadily from f/2 towards medium aperture settings although it generally remains within very good(+) quality scope here. …

The Ultron is a very sharp lens straight from the max. aperture but especially around f/5.6. The amount of distortions and vignetting is generally negligible in field conditions. Lateral Chromatic aberrations are a bit higher than average but they don’t reach worrisome levels. The biggest problem of the lens is the only average quality of the bokeh – the out-of-focus rendition. This is a bit unfortunate because this is one of the primary playgrounds for such a large aperture lens

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