I've only been able to test it in lower light indoors so far.
But the auto 65 pt AF was tracking better than other modes in some cases, which is kinda crazy. It was locking into my GFs dogs eye, which is dark, on a brown dog, up against a glass window. I moved the viewfinder low, so only the top points could grab focus on the head/eye yet, and it stuck.
But I mainly shoot wildlife, so we will see how it handles this weekend.