That era...actors who established themselves in the 70s is a murderers' row that is like the Hawerchuk / Stastny / Savard / Coffey / Bourque talk of the 80s. Dustin Hoffman, Warren Beatty, Harvey Keitel, Julie Christie, Diane Keaton, Michael Douglas, Alan Arkin, Christopher Walken, Donald Sutherland, Maximilian Schell, Martin Sheen, Anthony Hopkins, etc.
Williams was a shade younger...kind of a half generation younger like Michelle Pfeiffer or Michael Keaton but going head to head with most of those actors at the height of their powers in the 80s and 90s.