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The 58/1.4 G is an awesome lens Calibrating it carefully will give you great results. This lens quite often will require fair amount of fine tune correction. My lens required +20, and I sent it in to Nikon, and the correction now is +15 both on my D750 and D810. According the tech manager at Nikon this is quite normal.
Do check both f/1.4 and f/2.8 as there is a focus shift moving backwards as you close the lens down. I fine tuned at f/1.4 and checked at f/2.8 and tweaked it from there.
Once you have calibrated the 58/1.4, try the face/eye AF and see how it works with the D4S. With the D750 and D810 it works amazingly well
Typically I have only used the AF-C Single with AF back button, as I usually don't trust AF points being selected automatically. Although the AF points detecting and showing in the OVF are different parts of the face, the face and eye detection works really well.
For shots where I think face/eye detection is not appropriate, I revert to AF-C single point with the back button. I keep my finger on the button, with the narrow DOF, will allow for minor subject movement including myself.
Have fun !!!
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