Just to set the record straight -
My CFV back uses the Kodak KAF-39000 sensor, which according to the spec sheet has an active image size of 49.0 x 36.8 mm. The pixel size is 6.8 um. It does not have microlenses. Interestingly, there are two grades available - standard, and engineering grade.
I think that with the SWC a sensor using microlenses would be very bad news. The rear element of the Biogon is very, very close to the sensor plane - actually, I'm amazed that it works as well as it does. The light rays at the edge of the sensor must be coming in at a very low angle.
Another interesting thing which really we only become aware of when we put these old lenses on a digital back, is that just like the Distagons and in fact most of the old Zeiss glass, the Biogon is optimised for the far field. It does close focus (down to 12 inches) but close shots are OK but not stunning. When you get out to 30 feet plus, the lens comes on song and you go "Wow" as the detail snaps in. Which is just what you want for architectural stuff and church interiors, of course. For close work stick to the 120mm S-Planar.