I went out again yesterday afternoon to do a little more shooting with the Loxias. I'm fairly happy with the 35mm f2 although the very extreme corners do tend to get a bit soft at wider apertures - but where you focus in the scene seems to affect that as well.
What I am finding hard to deal with is the fiddly aperture ring on all of these lenses, being too close to the camera body and too close to the focusing ring. I don't know how many times I accidentally moved the focusing ring while trying to change the aperture.