Only you can answer that for yourself. I have a Sony A700 which is very similar to the 40D in both sensor performance and features: http://www.dxomark.com/Came

Only you can answer that for yourself. I have a Sony A700 which is very similar to the 40D in both sensor performance and features: http://www.dxomark.com/Cameras/Compare/Side-by-side/Sony-A7R-versus-Sony-Alpha-700-versus-Canon-EOS-40D___917_562_180 http://www.dxomark.com/Cameras/Compare/Side-by-side/Sony-A7R... I could definitely use the 2 stops more dynamic range and the 5x high-iso performance for day to day shooting. I'd love to have the good video as well sometimes. The 3x resolution wouldn't be too bad either from time to time, although it would take a bigger toll on the processing side (storage for the files and CPU usage for the raw conversion).