While the SL works great with both M and R manual focus lenses, as well as my Noct-Nikkor, the pain is waiting for the native L-mount lenses.
The 50 Cron-L APO has just been released. Read Jon Slack's review and look at the rendering in the supplied images.
Not that the comparision between the 2 50 APO Cron's is extensive, and the statement about which one is better is really only one sentence, but the APO 50 Cron-M is arguably one of the best M-mount lenses available.
Know that Jono is mostly a 50 shooter.