IMHO, while it seems to provide extraordinary performance, it is simply way too big for a regular use 50, let alone a MF one... I'll happily stay with my 50/1.4G AF for most 50 work -- it renders pretty darn nice. And then my (newly acquired) 50/1.2 MF which renders beautifully for the special stuff -- not pristine optical performance, just a gorgeous overall look I happen to like a lot! Actually, in full disclosure the little 1.2 is now on my cam like 99% of the time, and virtually never leaves f1.2 :ROTFL: