awsome job, very brutal, very intense. I'm impressed about your camera style. Very good work. Maybe you can post the cam, lenses you work with, budget etc.? This would be nice to know.
About the specs...
I used a Sony Z1, with P+S techniks 35 minipro adapter. We had only 3 very old "Leica" prime lenses with us. They helped us in creating the rough and dirty look. The set contained a 20mm, 28mm and 50mm. Only once I used a 100mm lens for the group shot of the mobsters after the train goes by in the end scene.
I wanted to create the feeling of a very objective look, like an outsider looking at the scene in contrast to the entire movie use of wide lenses that gives the inside-the-scene feeling. when you see the short lens for the first time near the ending you know that something has changed, this marks for me the resolve for the conflict that leads to the ending. thats the only reason i used the short lens, but only once. (geez... that was heavy)
The budget for the production was 3000 euros... very little. we got some deals and help from university which saved us a lot of money so eventually we managed to pull it off.