Just take a look that how well Fuji XT 3 (B&H | Amazon.com) camera tracks eye of the subject. It’s look like Fuji engineers done too much of hardwork to bring out the Eye AF tracking tech to Fuji. At the same time if you are a user of Sony A7III or Sony A9 camera then you will find Fuji AF eye tracking tech is not upto the mark as we have seen in Sony, however, one of the great thing that Fuji finally introduced it and we may see improvement in near future via firmware updates.
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Eye af is more then a year behind Sony.
Gotta say Sony is amazing.