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I think Leica R lens can be divided to two group quality, Bench quality and real world quality.
In Almass's lens recommendation list, other than 50lux and 80lux, I think rest all belong to Bench quality, (certainly having real world quality at the same time) which usually require a huge prime to getting them.
But for me, real world quality are the main reason I pick R. they come from 50lux any version, 80lux (portrait only), 35cron(other than f8 landscape), 35lux, 50cron, 90cron.. I found them perform extreme good WO at f1.4 or f2 most of the frame, smooth transition, no SA,(except 80lux) no CA, gentle color. Rest 20% of frame, when use at WO you can see jittery bokeh, soft corner etc (example: 35, 50cron, 35lux at f1.4, 50lux VI/II at f1.4...)
I won't claim I can pass blind test but general speaking I can trace Leica R's specialty in rendering. That is the reason I would pick several R lens over M equivalent, even M may(most likely) have better bench quality.
I believe its inherent render quality can be traced in good hand with right subject. For my photography, I use R lens for my family pics, They suit me perfectly. 100% case I don't require bench quality, I love the lens I have and plan to keep them life long....
The beautiful rendering in DOF and color and moment in life are priceless.
50lux R WO
35lux WO or f2