no one? Not entirely true, you can add Cade McNown, Rex Grossman and Jim Harbaugh as other 1st round picks that did not work out.
That is 5 1st round picks that are all busts or at least not high level NFL players. You say Fields has potential. What did the NFL say he was worth? A 6th round pick. Yikes.
I have nothing against the Bears nor Caleb Williams. Maybe he will break through for an organization who hasn't had a good QB in a really long time. I just doubt it.