Face porn - you get to see every hair follicle, eye vessels up close in geographic detail. My D800E paired with the Zeiss 100/2 makro already does this too well in 1/500th of a second so this 30 min sitting is not practical it's an extreme art form.
My Rokinon 35/1.4 is excellent. I'll wait on buying the Nikon 24/1.4G until I see how good this Samyang(rokinon) is.
It's good but given the huge number of images submitted I'm disappointed. Off hand can think of a dozen photos taken by James Nachtwey that are more powerful.