Well guys,
I tested the Leaf Aptus II-12 today and I must say, I was impressed.
For setting up, it was just a question of swapping my Aptus 65 for the AptusII-12 and everything worked fine from the first go. In fact, for those updating from another Aptus, the transition couldn't be smoother, nothing new to learn! The lenses image circle (I tried the 120 Schneider Digitar and the 180mm Rodenstock Apo Rodagon Digital) covered the sensor well with my usual Sinar P2 camera movements, I didn't notice anything different in terms of lens coverage.
The files took a bit longer to appear in Lightroom at 100%, but that's to be expected from a 240 mb file and absolutely no problem for a still life shooter. I only tried it at the lowest ISO, because I'm not interested in higher ISO's.
I tried the on-the-fly sensor crop to 1:1, 3:4 and the elongated one (I think 16:9) and the live View automatically crops to the selected sizes. Very nice back, nice colours, like all Leafs.
Because I shot some proprietary items, I'm unable to post files, but they are similar to the one that Yair posted of the colourful still-life with fabrics, which is a good representation of what the back can do.
Edward