This tracks pretty closely with my experience with this over the last 2 and a half weeks. The biggest annoyance so far is definitely the banding issue, though I've done some unscientific tests with my 5dm4 and most of the banding visible from lights in the R is also visible in shots from the 5D, so I can't knock it too much for that I guess (How I miss old "real" light bulbs).
The biggest difference between specs and real-world usage for me is definitely battery life. I've gotten over 1000 shots each time I've used it, and the battery level only reaches a bar or two down from full.
And as Jared mentions, the touch screen focus point sliding alleviates some of the problems from no joystick, but you do have to move your face away from screen a bit. Even if you have the focus slide area set to the button corner, it seems like and contact to the rest of the screen makes it harder to drag the focus. And since my nose is usually touching the left side, this has been a (minor) problem.
I do wish that you could just set the function bar for straight-up AF, because the placement of the back AF button is now too close to the right side, which basically negates the better ergonomics of the bigger grip size. My hand get particularly sore after just five minutes of continuous shooting because I have to pinch my thumb in unnaturally far.
but bottom line... I started using this side by side with a 5Dm4 at first, but my last shooting sessions I've taken this by itself and I'm not missing the 5D. I usually had two cards in the 5D but I never shot to both at the same time since the SD card slowed things down, so one card isn't that big a deal for me. The burst rate/buffer are great, and I'm using a mid-level SD card. If I only need one body during a shoot, I'm totally comfortable taking this as my sole body (with a couple backup SD cards).