I've browse through some threads and reviews over the net and find out that some uses
"I have finally found a sharp copy of XXX lens", "you must have got yourself a sharp copy",
"Gotta return this lens and look for a sharp copy" etc etc..
May I know what do they mean by that? does that mean if i got 2 exact same lens of same
brand, same model but the IQ I will get from the 2 lenses may still differ? is it like
buying pokemon booster pack? packaging may be the same but the cards inside are different?