Quote Originally Posted by 7dfever
ii) I have seen some posts here saying 17-55 is sharper than 24-70 in all relevant range if using it in a crop body. Is that true?

It's true, but the difference is small. The 17-55 has slightly higher microcontrast (sharpness), but the 24-70 has slightly less chromatic aberration and distortion. The L also has less vignetting. I'm not sure how they compare on flare.