umm....first off.....looking at a penis and being able to accurately tell its size is highly unreliable. A man's heighth, weight, body size, shape, pubes.....etc. all skew the perception of size. I, in fact, highly doubt that there are large number of men who are 6 inches or above. 8.5 inches is practially unheard of, and to make such claims of having a penis that large is proposterous, without an unedited picture of ones erect penis, with a ruler or tape measure pressed against the top side of the penis, in a totally unobstructed view.
Also, FLACID SIZE IS NOT AN INDICATION OF ERECT SIZE! That is a FACT! I've seen men with 6 inch long flacid penises, who, upon growing erect, grows no more than a half of an inch.
If someone says your cock looks big (or even if they don't) its all about their perception of your penis, not the actual size.