I haven't had my hands on camera yet. Video above is best review I have seen yet. Max usually does best reviews when cameras are released. Philip Bloom's reviews take much more time.
I didn't have any plans to go full frame but this camera has almost everything I want for reasonable price. 50/60fps 4K video is only thing missing but 1080P slow motion looks really good. Low light is really good. IBIS looks usable. I am looking for camera with usable IBIS. I don't think A6500 has good enough IBIS. That is why I still have A6300 and not A6500.
At the moment this is not on my shopping list. I will wait for A6700/A7000 for little bit longer. Both names have been in rumors. That camera will probably be close to what A7III is in APS-C format. I have almost every lens I need in APS-C format. Getting similar set for full frame would cost at least 4000 euros. Even with that my APS-C set would be better for gimbal and probably few other uses too. I could use them with A7III on crop mode but I would lose some picture quality. Not much but some.
If A6700/A7000 isn't announced this summer or earlier I might have to consider A7III. It is really good camera not only for the price. It is really good camera. If I didn't need to buy another set of lenses I would be really tempted to buy it.