When I was searching the adapted rangefinder lens reviews, I found Sean Reid's lens reviews with Epson R-D1 on LL. Epson R-D1 has 1.5 crop factor (and maybe used a Sony sensor) so it gives a very good starting point for rangefinder lenses, which can be used on Nex cameras. I have/had dslr manual lenses, but I found the RF lens size as optimum with mirrorless cameras. Also it can answer some of the questions about the vignetting, corner performance, contrast, and sharpness of these lenses.
Field Report: 35mm and Wider Lenses for the Epson R-D1
Epson RD-1 Lens Report
Fast Lenses for the Epson R-D1
Luminous landscape
Serhan
Field Report: 35mm and Wider Lenses for the Epson R-D1
Epson RD-1 Lens Report
Fast Lenses for the Epson R-D1
Luminous landscape
Serhan