The 5DII is an FF camera and as such it offers many ways to improve your skills as a photographer. I do like crop bodies, but it is not the same. Since owning a 5DII, looking through the viewfinder of a crop body gives me the feeling that something's missing. In terms of RAW IQ, the 5DII at least performs equally well as the 5DIII (except for higher ISO). The attached image may give a slight impression of the fact that the 5DII is not basically incapable of taking photos of fastly moving objects. This photo of a home-flying snipe was taking when dusk had already started to settle (ISO 640, f/8, 1/1000, 1.4 Kenko TC, 70-200 f/4 L IS, very little post-processing). It's the best out of three shots taken.