This French action film screened at TIFF last fall. It was one of my favourites then and now it's playing in T.O.! Here's my posting from the time.
Here's the NYT review, but reviewer Nathan Lee seems to have Damien, Cyril Raffaelli's undercover cop character, mixed up with that of Douglas Belle, who actually plays Leito, the slum-dwelling good guy.
Raffaelli is the martial artist while Belle is the parkour master. Watching the bad guys try to catch Belle is like watching someone trying to trap a drop of mercury.
If you're an action movie fan, put this on your to-see list.
BTW, the Toronto Star's Geoff Pevere gave it 2.5 stars out of four. In Now, Glen Sumi gave it four stars.
As a regular movie, I'm with Pevere. As an action movie, I'm with Sumi! :)