OK....I noticed this "issue" when testing my Sigma Art Lens (I won't go there right now..this is a totally different issue related to my 5DIII body only), and wondered if anyone else is experiencing this phenomenon. I experience the phenomenon with both my Sigma and my Canon L lenses, so I believe it is a camera-body issue not a lens issue.
I have AF Point Display enabled in the Playback menu on my 5DIII. So when I focus on something with a particular focus point, the red focus point square will show when I view the image in playback mode. (when you zoom the image the FP disappears). See second image below to enable the feature on your camera.
So my playback focus points do not correlate with my shooting experience. On playback my focus points are ALWAYS shifted to the right from where the FP was in my VF at time of shutter actuation. I would say about 1/2 to 3/4 of a focus point shift to the right (see image below). This is a consistent shift. No variation.
When I shot the image below (don't laugh...I could only find a stuffed stationary model for the shoot!!! LOL! with bad lighting I might add..very cloudy here today), the FP is bullseyed on the eye. The eye was directly in the center of the FP box when shot.
Furthermore, when I use the "Show Focus Point" Plug-In for LR (actually this is where I noticed the phenomenon as I can view my images at 100% in LR and see where my focus point was when I shot the image), they are shifted exactly the same. I also get the same exact results in Canon DPP (latest version).
I also have to thank Dustin Abbott
for mentioning the LR plug-in in a recent lens review he did. It is a helpful little tool! I never noticed the shift as the FP are so small on the back LCD as my eyes are old an struggling. (Like the rest of me!
So I guess I wanted to open a discussion to see if anyone else is having this phenomenon....and what might be causing it. ..and of course I am wondering ...when I focus the camera are my focus points in the VF "lying" to me. Are the real points on the sensor actually all shifted slightly to the left?
Its a can of worms!!!!!!
Under my "model" I posted a pic of the menu screen where you enable the Focus Point to be seen in the playback image to help anyone set it who does not have it activated. (Its a helpful tool in the field!).
It doesn't make my camera useless....but it is a concern.