I like the combo of IIIf and Elmar 50mm f3.5. I read someplace in around 1964-5 that Leica struggled with the switching from the Barnack film loading system to the M model loading system because they were concerned about consistent film flatness. I feel that there is something to this worry. Maybe the M models are great with film flatness but the Barnack bodies are excellent in this regard.
Anyone else ever hear of this concern?
I also like the Pentax Spotmatic and the version 2 50mm f1.4.