I recently watched Villeneuve Pironi. It gave an excellent overview of their careers with interviews of those who knew them (wives, children, their race engineers, drivers they raced with). As a Canadian I always knew more about Gilles than I did Pironi. Both men were a great loss to sport.
For me, the biggest 'bombshell' of the documentary was learning that Pironi had twin boys born after he died, and his wife named them Didier and Gilles (with the permission of Joann, Gilles' wife, who comes across very well in the documentary. Though I suppose she's lived with the story for 40 years, she knows exactly how to talk about it. Jacques comes across more... awkward. He's well spoken and insightful, but clearly doesn't want this to be part of his life. I suppose nobody wants to do documentaries about family tragedy.)
I'm very happy that there's a lot of high quality documentaries coming out about F1. I hope the Brad Pitt movie is worthy of them as well.