Again thank you all for your input. I managed to test the EFS 15-85 and the EF 24-105 together yesterday... I desperately wanted the L lens to be great, but alas the EFS 15-85 was considerably sharper. Although in the future I probably will upgrade, I do agree with neuroanatomist (and my wife) in getting the right lens for the right body. I am going to go for the EFS 15-85. Much appreciate all your support and responses.