A note on the Canikon issue that is only tangentially related but I was between 2nd bodies for a bit. For $2,000, that A7III looks great on paper. I needed a wedding backup camera and my rule is two full frame bodies, both with dual card slots. I have been running the 5DsR and thought of grabbing a 5D4, especially when it was as low as $2,400 recently. But was able to grab a used 5d III with a grip for $1,200. Decided to go with the III. Yes the dynamic range is deplorable, but I've sold enough 24x36 and 20x30 prints with it to know that its a fairly capable camera for 99% of images I'll ever shoot with it. Specifically for people, I'm usually adding light to the subjects in the foreground for a dramatic sunset anyway so its mostly a mute point. A bit of color noise in the OOF shadow areas isn't usually noticed by photographers, let alone clients.
It sounds as though Sony has come a long way with reliability, battery life, and now has dual card slots (finally). But they're still obsoleting their cameras, what? every 12-18 months? The familiarity and ergonomics with Canon were too much to pass up, plus the fact that I could probably use that camera for another year or two and sell it for close to what I'm paying for it now. Sony don't seem to hold that value for a variety of reasons..