While an interesting exercise I don't believe that they showed anything. The truth is even the title is wrong. Why? Because each photographer shot a different man. Sure, it was the same human body, but the minute they were told something that cast him in a different light they had a different man. Had they all been told the same thing, or nothing, then the differences would have been purely the photographer's interpretation of what they were told, or what they were able to suss out of the man before shooting.
A great portrait photographer has the gift to show the human being through their eye. They either do that in order to show something specific about the person, or something specific about that person in that environment. To give each photographer a different person shows their ability to capture the profession as it applies to the man, and not the man himself. Interesting, but I find no inherent learning to the results. Had the profession been the same, or each was asked to interpret the person in each of the roles, then comparisons would have value.
