Looking forward to this. Appears to be getting a limited release in New York and LA at the end of July. Apparently, too, it just played at SIFF but somehow I missed it. 

Here's Michiko Kakutani a few years ago reviewing the Brando biography, “Somebody”:

He was hailed as the “Byron from Brooklyn” (though he was from Nebraska, not New York), a “genius hunk,” “the Valentino of the bop generation” and the essence of “the primitive modern male.” John Huston said he was “like a furnace door opening” — so powerful was the heat he gave off. Eva Marie Saint said he had the ability “to see through you” and make you feel “like glass.” Jack Nicholson said he had a gift that “was enormous and flawless, like Picasso”: he “was the beginning and end of his own revolution.”

About “On the Waterfront,” Roger Ebert once wrote: “Brando cut through decades of screen mannerisms and provided a fresh, alert, quirky acting style that was not realism so much as a kind of heightened riff on reality.” Elia Kazan went further: “If there is a better performance by a man in the history of film in America, I don't know what it is.”