EOS R5 Eyes out of focus

[rkpsrh]

I have a canon EOS R5 on a tripod. I have a Canon 28 to 70 mm f/2.0 L. I have face tracking on and eye detection enabled. My subject is 10 feet away. My ISO is at 200 l'm at f/2.0. My shutter speed is 1/8000. And I'm using a Canon 600EX-RT speedlite. In my studio with an open window on a sunny day. My subjects eyes are still out of focus. My subjects eyes are still out of focus. Not anywhere close to tact sharp.

[p4pictures]

The EOS R5 (original / Mk1) can only do eye tracking / detection when it is also set to face + tracking AF method. It can track a face - but not eyes - when set to one of the three Zone AF methods. For a subject such as a headshot like you posted I would be using Face + tracking AF method, and make sure to set the initial AF point for servo AF to AUTO, and also use servo AF. 

I have the RF 28-70mm F2L myself and love it. I've used it with most of the R-series cameras over the years. Here's a selection of portraits all at f/2.