Originally Posted by GLXLR 
As most people already know, all the limiteds are assembled by hand so QC should be much higher already.
All lenses were assembled by hands afaik from the cheapest to the most expensive.
I am too lazy to dig my lens box from basement so you will have to live with my sample.
What I have found with this lens is that the focus could shifted easily once "focused". The difference in sharpness could be quite dramatic.
http://www.pbase.com/wlachan/image/114284618