Yes, I shoot at ISO 80 all the time! NOT.
ISO 400, Canon EOS 10D. 100-400L with EF1.4II.
There is NO noise in the dark areas of the print (Canon S9000, 13x19 size)
I'm sorry, but why flog a such an inferior product? It's like all those folks on who say their Sigma 15-30 zooms shoot as well as the 16-35L...once it's at f11.... Yes the 14n is cheaper, and unfortunately...it shows!
my 2 cents....
stu