About the FF lenses not performing as expected; I did a similar 50mm shootout the other day, but on the smaller µ4/3 sensor as used in the Panasonic G1. Checking the borders of all the lenses, 5 or 6 of them, the modern Sigma 50/1.4 was the best one.
Some of your images looked better than some of mine and I wondered why until I noticed you used a Nex camera. The stack of glass elements in front of the sensor seem to cause troubles for many lenses when used with µ4/3 cameras.
Some of the lenses I tried performed better in the "distant resolution" test than in the "short distance" test.
Nice test! I have owned some of these lenses and I think your results matches what I am, or was, used to get as well.
/Jonas