I know there are countless threads dedicated to Grey vs Non-Grey, but most of the discussion relates to price and warranty.
i have one question, are the lens identical? Are they all made by Canon? Or is it like buying a genuine Versace bag vs a knock off (i.e. the knock off is not made by Versace and the quality of goods and manufacture are inferior to the genuine article)? What i'm trying to find out is are the grey lenses inferior to a non-grey lens?