I did manage to find a few photos taken with the CZJ 135/4 on a NEX 5N (as well as a few other cameras) on Flickr. Is it bad form to share public photos from Flickr that don't belong to me? To err on the side of caution, some of they can be found here: http://www.flickr.com/search/?q=zeiss%2013.5cm
Looking at some of the dog photos I really like what I'm seeing and now kicking myself for not waking up early enough to bid on the lens I missed. I have not seen another L39 mount for sale since that one.
The Sonnar 135 f2.8 in C/Y mount is superb, overlooked, and hence, underpriced. Getting it to Leica mount will be problematic, but on EOS it's a stunner -