If there's a thread that needs some objectivity, it's definitely this one! The OP discovered how many varying opinions there are for the same blade.
It's interesting that those tests found Feather to be one of the duller blades.
I suspect Feather's don't have a very smooth edge, and people associate that with sharpness. The random nicks that Feathers seem to give also seem congruent with that. But that's just an hypothesis.
Gillette actually did some tests in the 60's and found that most blades are very sharp, however, people perceive less smooth blades being less sharp. This lead to the development of polymer coatings for blades.
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