So I just tried the ZV-E1 among other recent releases and here are some quick thoughts:
The build quality is better than I thought, nothing like the previous toy-like ZV cams and much closer to current A7 series, probably closest to A7C. Unit carries a certain weight so balances ok even with bigger (prime) lenses.
Very minimal design and button layout. While this may seem like a con its also a pro, kind of reminds me of Leica philosophy. Yes sometimes less is more.
Set the shutter speed with the dial, aperture with the thumbwheel. Zoom with the rocker switch. Jump to stills/video/S&Q with the mode switch.
Just about everything else is done on the touchscreen like a smartphone. This is where things start to go a little sideways. The tiny 3" display and small fonts of the settings require precision, and the Sony menu and overlays don't help. But it is still more handy than most other A7 cameras with their limited touch capabilities.
By default just about everything is automatic, like a smartphone. Basically point & shoot. And it works pretty well as in no major jarring issues. The AF is top notch, I tried several lenses including my F1.8 Zeiss and it didn't skip a beat.. smooth AF, pun intended.
No surprise about the IQ, its an A7Siii sensor. Clear image zoom via the rocker switch is killer though, really like that function lifted from FX3.
Tried the AI reframing stuff, didn't gel with it. Applies a huge crop.
Now about the overheat. After 15mn of shooting 4K60p indoors using lowest bitrate codec, the camera shut off with no warning. I thought the battery had died lol. That was on the normal level heat setting, so I put it into high and didn't run into the issue again but I was shooting short clips, changing lenses every 5 minutes and didn't spend more than an hour with the unit. I didn't have a fast card so wasn't even able to test out the higher bitrate settings or ALL-I. The camera did feel warm after about hour.
This pretty much confirmed my suspicions through the reviews that this camera is not fit for pro/extended use but rather casual shooting. I still find the price of 2799€ pretty bonkers for a camera with no EVF, single card slot, zero cooling, no mechanical shutter etc. But the IQ and snappiness is impressive.
That being said, it does make the A7SIII feel somewhat sluggish & dated. And all this tech in an A7 body would be nice. I guess its a good preview into what's to expect in upcoming higher end Sony bodies..