If I have learnt anything, its that the sharpest blades are not necessarily top tier. Top tier is NOS stainless blades like Gillette Super stainless, Platinum Plus or UK wilkies. Nothing produced today compares to those classic blades.
I stuck to modern, accessible blades in my original post. But, I do agree with the sentiment on the NOS blades. I have slowly stockpiled, but nowhere near enough. So I can't really recommend them to most, because the time and money involved can get well above the modern blades mentioned in this thread.