I read up on that^^Nice lens...Ok so now that ive been digging some more I need help..lol So I know in my heart upgrading to full frame is far away..(too much $) So I wanna pull the trigger on Sigma's 18-35mm or 50mm-150mm..........These are the sharpest lens going right now for the D7100....17mp on either one...I know that both are made for APS-C Bodies...But I don't care at this point...Nothing but great reviews.. I need something wider but want the longer focal for portraits.... So if you were me,which one?