Here are some test shots with the Minolta 40mm f/2 M-Rokkor for the Minolta CLE. This is the multicoated version of the Leica 40mm Summicron-C. We used the very compact 40mm M-Rokkor walking around a local train museum with the Sony A7r via a Leica M lens adapter. The shots up to the handcart are all done at maximum aperture of f/2. Manual focus was very easy with using the viewfinder magnification of the A7r even in the mid-day sun. The mid-day sun also guaranteed high shutter speeds at ISO 100 and f/2. All the shots are handheld.
The shots below are at f/5.6 up to f/11. We need to test this lens more but the sweet spot is definitely at f/5.6.
The CSX 152 (GE AC4400CW diesel-electric locomotive) and the CSX 7305 (GE C40-8 [Dash 8]) was shot during the afternoon sun.
Sony A7r with a Minolta 40mm f/2 M-Rokkor via Leica M Adapter
The lens has been great on the Minolta CLE and NEX-7 and it performs well on the full-frame A7r. The lightweight and compact 40mm M-Rokkor with a fairly fast f/2 aperture should always be considered for the A7 if you want to try Leica M lenses.