Quote Originally Posted by markbarendt View Post
I also believe that it's not the same for everybody, .
Exactly! The Jones et al papers used a panel of viewers to rate the images. You (and most advanced film users) don't need a panel of viewers to judge the exposure of the negatives used for your prints. Though most beginners and casual users benefit highly from the information contained in the ISO number and it is good for everyone to know how the ISO numbers come to be.