I already had the first version, it is unfortunately crashed in the mountains and so I picked up the newer version. I use the lens on a EOS 40D and EOS 7D. The lens may not be the fastest from AF, but resolution and free processing / lens quality are still exemplary Under rich in the test peaks. I highly recommend this lens over again. My tip: Who photographed in RAW format, should work for the development / correction with the software DXOptics, the results are absolutely top.