35mm lens poll.

My experience with the 50mm ART and 50mm L was that if I wanted to truly compare their sharpness I had to go through a full micro focus adjustment with both, on the same body, before I could compare them. I used FoCal to do that and it also would give me its interpretation of the sharpness achieved in calibration.

Also with the way the 50mm ART worked I had to use the dock to get good performance across several focal distances. The Canon can't do that but you can run FoCal at distances different from the recommended distance base on the lenses focal length.

I know a lot of photographers who think there getting a really sharp image without doing any micro focus adjust (I thought so too) but when I used FoCal I always improved the performance since not one lens was ever calibrated out to a value of 0.

I have a 5DIII and 1DX and the MFA values were not the same on the two cameras. I had to rerun FoCal on each. I calibrated and adjusted the 50 Art with its dock on the 5DIII and then just did an additional MFA on the 1DX. I tend to use the 50A more on the 5DIII than 1DX which is why I did it that way.

I don't have a 35A to compare my 35L to but if someone has both and FoCal I would like them to post the results of a fully calibrated system for comparison.

I will also admit with the 50A I saw some other real world focus accuracy issues I couldn't pin down. I did this work last fall so I don't have the 50A anymore to follow up on it. I think there are some cases where the AF system can be fooled but I believe that do more to what you chose to focus on but I can't state that definitively.