Ricoh would not lose anything if they'd open the API or even the source code for the app, letting their customers and fans work on a better program. That would also make them stand out positively against the big competitors. But that's not the way corporations think, unfortunately, not even Ricoh.
In the 70 & 80s, the Pentax cameras were standing out for being the smallest of the SLRs.
I am SO waiting for a super-wide-angle fix-focus lens. I'm currently using the 8-16mm Sigma, but I'm not too happy with it. A simple 8mm would have done just as well. There's no need for a 2x zoom, IMO.
In light of Pentax' information that some non-F lenses will still work on the FF sensor if stopped down, it might be good if you also took test pics at full aperture with all the lenses you try.
Sharpness is pretty good, isn't it? CA is visible in the corners but that's to be expected, and can be corrected in software, I assume. I wonder how other lenses on the A7 perform. Do you have matching lenses, maybe Zeiss, to compare them to? Then it might be interesting to take pics with both next time.
Also, regarding the depth-of-focus markers on the FA lens. Do they still apply correctly with modern hi-res sensors? Have you tried?
I anyone finds adjustment instructions for the K-3, especially adjustment of the mirror position, it would be much appreciated.
The sand test is a joke - it's way too coarse. A good test (which I experience myself) is to test with the super fine dust of a dried salt like (in my case: in the black rock desert, nothern Nevada). That's super fine, (alcaline) corrosive and sticky, and it's everywhere in the air, even. Your hair gets sticky from it after a while. I had the camera (K-20D with DA* 16-50) standing in the hot sun for several days, taking time lapse pictures. No problem, the lens is still pristine, and the camera only got some of the sand into its view finder, though the slider for the the eyepiece. I could shake that out again. Not other "damage".
Kivis - the WR lenses are not as well sealed as the DA* ones - I'd be careful with those under running water, and not zoom while it's wet.
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Thomas Tempelmann 
Ruckus