Very good post. The images are interesting. At first glance, there didn't seem to be much difference - but look on the top of the first images - at the framing of the rectangular elements (tombstones, or in one of the pictures, a vertical window). The OOF rendition of the leaf lens is more gentle, the transition from the striaght line to blur is more smooth. In the FP lens, there are more remnants of the strong vertical edge still lingering in the image.
For me, this is one of the great strengths of the Schneider lenses on the Rollei system: the OOF rendition is just ... creamy smooth. Very delightful. It may not show up well in the reduced on line version, but its there nonetheless. A good Leica lens has it too, but there are examples of both that can lose it also. For example, the 60 mm Schneider is fantastic, the 40 mm a bit harder edge to it. Still good, but not quite the same. It may take some time to figure out the specific quality of each lens design.
Does anyone know if these are new formulations by Schneider, or just new housings?
Geoff