Hello Tom,
I have purchased an A7R III. It is my almost exclusive camera now. I have no problem with the EVF, as a matter of fact when I try again an SLR/DSLR, I realize I prefer the EVF.
The best point about the Sony A7R III is, IMHO, its versatility. It is expanding my shooting envelope, It is still small and light, even though it has grown in size and weight since the first generation. I have no issues with battery life, which lasts a day of heavy shooting, even in the cold (- 20°C). Image quality is excellent, of course.
My main problem with the camera is the configuration. The amount of options is overwhelming and you need to spend time to get the most out of it. However, I do not mind a learning curve if there is an outcome (growing my capacity).
For the lenses, I use only primes, Sony or Zeiss. The good ones are expensive, but the sensor is demanding. Using vintage lenses with adapters does not give results that I consider acceptable. I regret that there are no native tilt-shift lenses available.
Overall I am extremely satisfied with the camera.