A new review appeared on a Japanese site and they shot an ISO ladder outdoors. But they shot all images at high resolution which means that the tiny pixels were left to fend for themselves :-)
Pixel peepers will be in agony, so I am not going to bother with crops. The chroma noise is not horrid, but the final results at 3200 ISO are nothing to write home about. Of course, I could have processed it much darker and that might have hidden more of the mess in the sky.
You will notice that the processing gets heavier and heavier as ISO goes stratospheric … but that’s what it takes to have presentable images when they are shot at high resolution …