i used that lens a lot when i first got it and yes ca was noticeable on the photos i took with it. It is also the only lens purchase that i felt wasn't worth the money, because i could have waited a while longer and gotten the 24-70mm. Then i would have had some L quality glass and the ability to upgrade to a full frame sensor sooner. In the end i spent even more money to get the 24-70mm and love it. That being said the 15-85mm was still a way better lens than the kit lens.