You heard correctly, it actually talks about that in the extras, Sly (big surprise) has a great deal of HD technology at home and is such a fan of it, he wanted the fight captured like that, and apparently mimicked an HBO Pay Per View fight down to the finest details, even the camera positions and angles are primarily from the points where they would have camera men for a real match, a nice bit of authenticity to it, but the most mind blowing revelation of the extras, sorry if this seems like a spoiler, but ever hit in the film is genuine, there was no swinging and ducking, they both took blows, very impressive.