Lots of my friends are switching over to Sony. Sony high end gear works better out of the box. My Nikon fluorite 600mm f4 E and D850 has to be recalibrated for

Lots of my friends are switching over to Sony. Sony high end gear works better out of the box. My Nikon fluorite 600mm f4 E and D850 has to be recalibrated for wide temperature changes. I expect my DSLR and lens to know when its in focus, not for me to have to tell it periodically where best focus is.