me neither. i think people just see a dude with metal somewhere in the vicinity of his face and want to call "copycats," and that's just not the case at all. the comparisons to re4 are completely valid, mind you, but it's taking those mechanics and doing some really new, cool stuff with it.
instead of focusing on anything it might be borrowing, what about the stuff it's doing that's so totally new? as people have mentioned already, the great user interface, and the zero grav rooms? chopping off body parts with a laser isn't completely new, per se, but it's certainly one of the first games so far as i know to push that to the forefront.