If I remember right it was clean. I don't remember the specifics. And I couldn't find the files so can't recheck as well. So can't check and conclusively answer your question.

Also remember that the cameras do different types of in camera noise reduction processing even to the RAW files. So Raw is not raw in the real sense. There is processing applied.

Increasing the exposure in post is not the same as setting it in camera.

My current stills camera is the 1DXII and I don't have any issues with the noise. So never thought of testing the intermediate ISOs with it.