Who is at fault (car accident)?

Sorry, this might be a long post. I was in a car accident yesterday, the guy in the other car was making a left turn onto the street with 2 turn lanes. He was on the outermost turn lane, in the middle of the intersection. He claims he had the green light. I was approaching the intersection, going straight on the same road from the crossroad. I know for sure that I had the green light, as I wait a couple of seconds after the red light turns green before I step on the gas (because of all the red light runners). My lane was empty, and the other guy out of nowhere crashed into me (the damage is on the drivers side door on my car, which was a big dent, but still driveable.) His car (a rental, at that) had more damage, the whole front bumper came off. He claims he had the green light, which I think he may have, but as he was in the intersection the light turned yellow then red, and he got stuck in the intersection (it is a very busy intersection). But then I had the green light, and I guess as he was stuck in the intersection decided he wanted to get into my lane instead, didn't see me and hit me. There are red light cameras at that intersection and I hope that they were working so it could prove that he is liable!! I also heard somewhere that in most collisions, the car with the front end damage is usually at fault. How true is this? Unfortunately I don't have collision on my insurance, so they won't pay for the damage, but I'm hoping his insurance company will see that he was liable and pay the damages in full.