My main comment is that I am pissed at Nikon that they don't allow high bitrate internal recording. I had to spend $1000 extra to make this happen.
Z6/7 came out with XQD card requirement and record video at abysmal 18MB/s. Now they support CFexpress card and still record 18 MB/s video - who runs this company...
Using Atomos recorder breaks weather sealing setup and usability, otherwise quality is good. When using Prores 422 recording one can still provoke posterisation in the blue skies, but it can be avoided with more limited grading. I like Z7' ability to switch between FX and DX in 4K recording, thus expanding the effective focal distance of the attached lens.
Nikon's marketing is just pitiful. There is no single Prores Raw video from Nikon (or any other third party) that would compel one to even try it. On Z7, considering imposed camera limitations in Prores Raw, I don't think I would be upgrading. 12 bit is attractive, but 10 bit log seems fine. I am not using Mac and with current support of Prores Raw I think its a great miss on Nikon's part. Braw would be a more sensible option.
Nikon's Image stabilization is more tuned for photo usage - when camera in still hand-held position, Z7 creates a very stable video, removing all micro jitters, however, when moving camera slowly by hand from a steady position, it appears as if sensor was "glued" in static position and then with a jerk follows the camera movement. On the other hand, when using Z7 on gymbal mounted on two-hand spring-loaded stabilizer (for vertical shake stabilization) I was able to record an incredibly smoooooth, like butter, footage, with the same OS (camera & 24-70 F4 S lens) turned on.