If Redford was Michael then maybe Max Von Sydow could have been Vito.

As Turnbull said, Al Pacino is etched in our mind. It is almost impossible to think of a different type of persona portraying our beloved characters. Redford would have been a stretch. Who knows what the results would have been.

Conversely, I couldn't see Al Pacino playing Jeremiah Johnson. Guiseppe Giannisoni maybe .