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Handheld at 600mm equiv. with an old $160 70-300mm f4-f5.6 4/3 zoom lens lens bought off ebay in "Good" condition @ ISO 6400.
The zoom barrel falls out of the body if I hold it upside down. Still I decent lens to play around with, I'll post more examples.
Posting this as an example of how MFT can perform at the extremes of it's performance envelope. Anyone with a FF camera please post ISO 6400 examples at the longest focal length you can, handheld.
See if you can meet or exceed this.