It appears as though you do not own, nor have you ever used, the Panasonic G5. I am trying to make buying decisions, and doing so requires I read reviews by people who have actually used the product, not read articles about it.
As for your description of the camera as "evolutionary" (sounds copied and pasted from dpreview), I can think of one major upgrade on the spec sheet, at the very least: The silent electronic shutter. Given the noisy, clunky shutter of the G3, which I own and am generally pleased with, silent picture taking is a major upgrade.
To replace a mechanical shutter, subject to failure, with an electronic one, is, in itself, Revolutionary.
I also believe the upgrade includes improved image processor and video spec, which would bring the G5 image quality up to the level of the Olympus E-M5, at a huge savings.
I have also read that autofocus and performance are both lightning fast on the G5, a significant improvement.
I have read the remarks about the G5, as have you. I'd like to read USER/CUSTOMER reviews, to learn about other people's EXPERIENCE USING the camera, not what they think it might be like, in theory, according to a pundit's first impressions. Even the pundit points out that a full review will be forthcoming.