On the primacy of exposure

My educated guess (EDIT: is the editor taking out spaces? It screws up formatting):

EV...... F/.... Image
15.6... 11.1.. D
15 ......9.1 ...B
14 ......6.4 ...C
14 ......6.4 ...E
13.3 ...5.0... F
10.5 ...1.9 ...A

mainly on the strength of highlight detail and (assuming that you focused on the fence) sharpness in the distant branches. What did you focus on? There are a number of inconsistencies that make me want to switch D and B and F and A. For instance the fence appears sharpest in E, which could indeed be the case at f/6.4, next sharpest up close is probably A, which does not make sense at f/1.9. I think I am more comfortable with groupings:

EV ......F/..... Group
15ish ..9-11.... B-D
14ish ..6.4 ......C-E
10-13 .2-5...... A-F

I am not surprised that it's hard to tell which is which between B and D, after all they are only 1/3 of a stop apart. I am a lot more surprised that it is hard to tell F from A, almost three stops apart.

Jack