Just to say that I received my adapter from Michael Leibfritz today, after my short holiday in Oslo with the family. I have only managed a very short 5 minute play with it, using my 280/4 APO and 180/2 lenses.
Firstly it looks beautifully machined. Easy to fit (R lens to adapter and then adapter to S body). Although you have to use MF and stop down metering, I don't find that a real issue. Michael's estimates of the max focussing distance seem about spot on - 12m for the 180 and 20m for the 280. I am planning to send my lenses to Wetzlar to get the max focus distance adjusted to allow infinity focus on the S.
When I get time to go outside, I will take a few test shots and post them.