So I'm shooting with a 28-135 USM on a digital Rebel. Pretty standard. I see some pics on the site that are just so razor sharp and crisp, and I think, I want my images to look like that! I'd like to pick up a gently used 40D, but I'm not sure if it's going to make the images that much better. It's still an APS-C sensor size, but it is an upgrade from 6 megapix to 10. Is that going to make a big difference? I think I would enjoy shooting with the 40D more, because it would shoot faster and feel heavier and more comfortable. What about putting a 50mm f1.8 on the camera instead of the 28-135? Do I really need to upgrade to something with a full frame sensor? I'm just not ready to drop that kind of coin. I don't really want to make the jump from Canon to Nikon. I like the features of Canon, and I think I get more bang for the buck.