I am remastering Crytek's Sponza scene right now in Cinema4D (not yet finished) for Gamestudio. I touch all objects and architecture parts, breaking normals, fixing polygon errors, making some new textures, adding missing normal/spec maps and so on.

This is currently a render shot, but I hope that I can switch to a realtime demo soon. Kartoffel is helping me with some shaders in the meantime.