Hi all, Im in the market for one of the above lenses. Thing is. Ive read a number of reveiws how the IS version isnt as sharp as the non IS version. Im not sure how much i'll use the IS features of the IS version and wonder if I should just get the non IS? Also the sharpness factor I hear about concerns me although alot of people rave how sharp the IS version is. I am prepared to spring the extra cash for the IS version but id favour the non IS if it was a sharper rather then haveing the IS feature i think. Anyone had hands on experience with these lenses?