Just did this. My AirPods Pro sounded a lot worse (very soft, muffled and way less resonant) than the pair of analog 3.5mm wired earbuds that came with an older iPhone.

I suspect it's because the wired earbuds had a mic near my throat whereas the Airpods' mic were up near my ears. The difference is very noticeable.

Looks like I'll be keeping my wired earbuds around for future conference calls.