Angoulême International Comics Festival, which is Europe's largest of its kind (comparable to ComicCon here in the states).
Lindner's unique perspective comes as a long time follower of Sfar's work and counters many of the jabs thrown at Sfar by many traditional film critcs by saying, "Drawing from Fellini and a love both of Serge and of the French chanson tradition, Sfar has created a film which is entirely "sfarien", and nothing to be ashamed of."
Although I haven't seen the film, this is entirely what I expect to see from it, and moreover, all films. When I'm looking at art, I want something to identify who created it (aside from the artist's signature). If anything, I'd be extremely disappointed if this picture didn't celebrate Sfar's background as an illustrator, a Jew, and a "fanboy" or someone wanting to educate today's generation of who Serge was and his importance to/place in the culture.
From Ellen's account (which you can read in it's entirety by clicking here) it sounds like I won't be disappointed.