Yesterday, I shot 400 photos of very stationary birds in great lighting in order to further test the 3D Subject Detect (have it set on my shutter button, w/ Wide Area - Small on the AF-ON button). The AF seems to work just fine compared to the other testing I did a few days ago, but it still feels less sticky. Thing is, I'm experiencing another issue...
In nearly every burst of photos, almost all of the shots are soft, as though the camera is back/front focusing. It's not motion blur or hand shake, it's the subject falling slightly out of the DOF. Bare 500PF and w/ the 1.4TC, didn't matter, nearly all of my shots lack that critical sharpness. Uploading an example from the same burst, of what I consider "critically sharp", and then what I'm seeing in my shots. This Cardinal is sitting still, there's no wind, shot handheld. Out of a burst of 23 photos, all but a few are like the 2nd shot below, and it's like this w/ every burst I did. Default LR sharpening applied, but nothing else. Expecting this to turn into "it's something you're doing wrong, I'm not experiencing that" session...
I'm debating downgrading back to 2.11, but at the same time don't want to dork w/ bricking the camera and/or setting up camera from scratch, so will wait for a fix (if it ever comes).