This looks like something I could do at iso1600 with my old APS-C camera, but then I'd need to do it wide open which would severly limit the DOF. With a modern full frame one could probably pull this off with iso 12800 and just stop down accordingly, without seeing much more noise. I agree it's still impressive to even push the modern FF to it's limits to match though (but comparison needs to be done at full resolution, not at screen res)