Day 2 with the M adapter, just a few things to add to yesterday's report.
-- For the 35 Summarit, the slight IQ decline I mentioned towards the edges wide open at infinity distance is often very slight to nearly non-existent. It was hard to get decent infinity shots because of the haze today, but below I've posted a shot from yesterday that's maybe about 3/4 of the way to infinity at 2.5 and then at 5.6, with upper right 100% corner crops for each. At infinity, it is usually not too much worse than this, and sometimes better -- i.e., this may not be an issue for most. Again, at closer focus distance and/or stopped down, there is no issue and things look great. For mid-range focus points, sometimes the bokeh is a bit odd; at other times, it is very nice. Overall, the results with this lens are excellent, even without having RAW files to manipulate.
-- For the 50 1.5 Nokton, the IQ issues wide open as you move towards infinity focus are more significant. At 1.5 and generally at 2.0, as you move through the focus range a haze sets in and there is often CA, esp at 1.5. At close focus, on the other hand, it's really great wide open. Beginning at 2.8 and really by 5.6, it is great for any use. Bokeh is great for close-range focus points, sometimes not so hot for mid-range focus points.
-- I tried the CV 75 2.5 a few times today. Seems pretty good wide open, although some CA, very good by about 4.0 or 5.6. So far, I like the look of the Summarit and Nokton better, but this seems like a decent telephoto option and I may use it some more.
-- Did not get a chance to test the 35 Skopar further. Have not tried the CV 15 again since yesterday's magenta corner issues.
I suspect the Summarit or Nokton will stay on this camera most of the time until Zeiss releases primes. I would be very interested to see how a 35 Summilux or 50 Summilux performs.
For the photos, again, lenses and f-stop are in the file name. Focus point for the first photo is "Co.", for the second is the top of the third column. These are JPGs from camera, some minor levels/contrast adjustments in Lightroom 3, exported as JPG. I've played around a bit with sharpening jpgs in Lightroom 3 (but not with these), which is not ideal of course, but the results suggest that when we get RAWs to manipulate in Lightroom the results are going to be really good.