Only a few quirks that I have with the 5D3. I wish I could adjust the Auto ISO and Shutter speeds similar to that of the 1DX for min/max settings...Low ISO noise in dark situations could be much better. Low ISO to improve shutter speeds during daylight operation is just fine with slower lenses. I wish the zoom button was like the older 5D II for review. Would like it to hold more custom settings and various setting modes, still need to improve on the auto sensor cleaning dept..