Dual ISO comparison, quick and dirty (or not as it goes).
This image was shot at ISO 2000, the upper end of the lower ISO range.
On closer inspection, sharpness and noise are very good, certainly better than M43, but there are other considerations.
Now one taken at ISO 12.800.
The image looks harder, but that could be the light. Still sharp and clean, but their is a little grain pattern in the background.
The dual ISO thing is still a bit of a mystery to me. I get it, but I don’t “get” it in useable terms. The application of it with video makes plenty of sense, but for stills, my instincts still fall back on what feels right.