There is a shorter answer. Users, 35/1.4, how about it? 50/1.4 (or the Nokton at 50/1.5)? The Putts can put words on paper, but what do users experience?
Here is mine from my use of a Bessa R and 2 Bessa R2 cams. The 35/1.7 was fine. 50/2 was fine but not as snappy to use. Focus was good, but when the 35 lined up, I knew it, 50 needed an extra look. 75/2.5 focused, but needed care and effort to make sure it was right.
So how about it, R2x users, what are your experiences? Math doesn't lie, but what happens in the field?