"Canon's press material for the EOS 5D states that it 'defines (a) new D-SLR category', while we're not typically too concerned with marketing talk this particular statement is clearly pretty accurate. The EOS 5D is unlike any previous digital SLR in that it combines a full-frame (35 mm sized) high resolution sensor (12.8 megapixels) with a relatively compact body (slightly larger than the EOS 20D, although in your hand it feels noticeably 'chunkier'). The EOS 5D is aimed to slot in between the EOS 20D and the EOS-1D professional digital SLR's, an important difference when compared to the latter is that the EOS 5D doesn't have any environmental seals. While Canon don't specifically refer to the EOS 5D as a 'professional' digital SLR it will have obvious appeal to professionals who want a high quality digital SLR in a body lighter than the EOS-1D."I played with the 5D when it had just been announced. Canon had one of these cameras at a press event and I do have to say that I was quite impressed. The first thing that struck me was its weight, it is quite light. second was its speed. With its numerous AF points, I feel like I could clearly pick up the silhouette of the people around me. The price of course puts this camera out of reach for most consumers, but what was disappointing to me was that despite that high price, I did not get some extra features I would have liked to see like GPS and Wi-Fi.