A whilel back I received my first DSLR camera as a gift. It is a Sony Alpha. It is a good entry level camera but has some issues. The noise levels are very high at any ISO above 100. Also the autofocus is, well, inconsistent. I have been using it on a daily basis and now have found the limitations of the camera in many cases. Mostly low-light and focus critical. I am ready to step up a level and am seriously considering a Conon EOS-5D. The reasons are, noise, autofocus, ready availability of lenses and accessories. The questions I have are: What is the noise like at higher ISO, 800, 1600? How is the autofocus operation? Any other comments will also be appreciated.