Thank you Jim, Manu, Michael, Philippe and others for your comments and 'Likes'
Personally I feel I am closing on my minimal R 'collection' with the exception of perhaps Summilux-R 50 E60, thanks to you Alex, and Walter Mandler's last needed piece the Summicron-R 90 [although Almas brings a dilemma of photographic uniqueness vs. optical perfection (Summicron-R 90 vs. APO-Summicron-R 90mm f/2 ASPH)] but otherwise I will stick to learning ups & downs of my current R glass for a while.
Great weekend to you, gents!