I must be stupid to have forgotten the legendary Nikkor 10.5cm and any of the latter 105mm f2.5 Nikkors which share the same design. It is the lens that made the Nikon name famous up to what it is today.
I don't really care about history and theory... but there is truth to it in regards to this lens. This lens is so unique that one can see how special it is just by looking through the viewfinder while focusing. No other lens does that (in the 35mm world).