My d4 got knocked off my drafting table last night and put a dent in my hardwood floor. I think maybe the camera landed on the edge of the L bracket, my thought was ^%$#@# ha ha!!!!
Anyway I took it outside and shot several frames to discover everything seems to be working ok. It knocked some dust loss inside the camera with several dust bunnies on the mirror and focusing screen. I just used a hand blower and a sensor brush and its good as new.
The old d4 is one heck of a camera, its a tough son of a gun.