There are interesting tests between the GH4 and the GH3. At 4K the GH4 actually performs a bit worse than the GH3 but to my eye it seems less "liquid-y".
Phillip Bloom on the GH4.
At one point I had found a thing which gave the equivalent rolling shutter speed for motion-picture film with a 180-degree shutter. Because there is a little bit of "rolling shutter" on old-fashioned chemical film. But for the life of me I can't find it.
§§§Sunrise and sunset times in Denver, CO.
§§§Over the years I've gotten in more and more trouble for stuff I post on this blog. I keep being surprised at who reads it. I'll probably end up putting more troublesome stuff on Pleasure for the Empire. "Troublesome" in this case simply means more information about what I'm doing.