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The Nocti shot is wide open. It's not mine, and only had the chance to use it during a meet-up photo-walk in an urban setting without any portraiture, so probably not a situation to show off its characteristics in that respect. I was also primarily fixated on using the M9 during that meeting, so really didn't do much with the NEX. A characteristic that is retained on APS-C is some SA wide open, which probably softens focus transition at this distance and closer. BTW, I also found it to be quite sharp wide open at infinity. APS-C definitely crops out the strong corner vignetting and cat's eye blur circles one gets on FF.
I really like what you've been posting over time with the 40 Cron, to the point where I will probably get one, or the Minolta version, if I find one at a good price. It's such a tiny lens with what I find to be interesting character. I think I'd be more inclined to get it over one of the 35 Cron versions.
I mentioned the CV40 because it seems to share some SA qualities of the 35 Lux pre-ASPH, meaning it will render a softer look than the 40 Cron, but the Lux probably has gentler background rendering. The CV also probably isn't as unique as the Olympus 42/1.2. I haven't used the CV35/1.4, but also haven't been that impresed with what I've seen from it. I primarily got the 40/1.4 because of its tendency towards strong/busy blur circles.
The 50/1.5 Summarit I've only used on the M9. Wide open it's quite low in contrast and only has reasonable center sharpness. But my copy has also apparently been 'serviced' and I'm not sure it was put back together with proper optical calibration in mind. I have some shots from it on the Leica M thread: here, and with a CV40 comparision shot, here and here
I think all of those had a fair amount of contrast boost in order to present a fairly normal tonal range. One good thing about its low contrast in full sunlight it will barely blow out highlights wide open at 1/4000 & ISO 160 on the M9. With modern glass I would have to shoot at around f/2.8. This tonal compression seems to work well with the M9's narrower dynamic range. I also see this to some extent with the Nikkor SC 5cm f/1.4.
Here's another 50 Nocti shot wide open where you probably wouldn't have guessed it was at f/1