Radagast in The Hobbit Film (SPOILERS)

[Boromir88]

Originally Posted by Rhod the Red

He was willing to badmouth his own superior, Saruman, both to Frodo & at the Council of Elrond (a public dissing). His restraint from criticism wasn't 100%.

By that time though Saruman was a revealed traitor and kept Gandalf imprisoned on Orthanc...I can't imagine Gandalf had viewed Saruman as a friend. Yet he still shows regard for Saruman as a powerful wizard whose designs drove Sauron out of Dol Guldur.