i did not say i can do this, all i said was, that the c4 demo uses very simple geometry with shaders applied - and that you can do this with gamestudio too(simple rooms with a normalmap shader, terrain...).
no model like a tree has animation, there is no grass, the movement in this demo is more than bad, you get stuck pretty often in some wall or stairs, weapons stick in the wall, particle effects look very bad and so on...and that is imho nothing to be excited about. in fact i even find the overuse of motion blur disturbing in such a showcase demo.
and i think its my right to express my opinion about this here, even if i can't show you a gamestudio demo similar to this.

btw, i would say the exact same about the gamestudio showcase demo, wich is in fact even worse, than the c4 one...