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I consider myself an EVF snob in the sense that I am *extremely* sensitive to things like stutters, repeated frames, frame rates, etc. I've spent much of my life also dealing with computer monitors and installing/calibrating various home theater displays so I have developed a hypersensitivity to certain things, for better or worse haha.
The resolution differences are harder to notice, but if you review images in the EVF at 100%, it's noticeable. During normal use, much less so. When you're actually shooting, brightness and smoothness matter much more - you aren't thinking to yourself "gee I wish that was 10% sharper" when you're focusing on tracking a bird in flight or whatever.
Another thing to keep in mind is that the optics in front of the EVF actually matter as well. A lower resolution EVF with good optics is nicer to use than an EVF that is just going for maximum resolution and nothing else. It's things like that which help lessen the blow of losing an OVF if you're used to DSLRs.
I personally don't review my images in-camera because even the best EVFs aren't as nice to look at as a good computer monitor. If you find yourself doing a lot of reviewing/culling in the field and need to judge critical sharpness, the more resolution the better. That being said, 3,000ish dots is plenty. I can easily tell which image is sharpest out of a set at that resolution, even if a higher resolution EVF would be more detailed, it isn't going to change your ability to check critical sharpness - at least it doesn't for me.
Right now, the only blackout-free viewfinders on the market are the Z8/Z9, but the others on similar stacked sensor cameras are good enough for most people not to care even if they repeat frames and occasionally stutter. The Z8/Z9 EVFs are also twice as bright as others, which in my opinion is very noticeable and something that is often overlooked, especially when dealing with high dynamic range scenes.
The really high resolution EVFs lower their resolution when combined with high refresh rates, so the extra resolution is of limited value unless reviewing images at 100% with your eye up against the EVF. In a case where all else is equal though, then the more resolution the better.
At the end of the day I think any modern EVF is going to feel "good enough" in terms of resolution. What I think you will find more noticeable is the brightness and if it's truly smooth or not. Smartphone screens are something many people can relate to as well - if you look at a 1080P screen, a 1440P screen and then a 4K screen, they are not easy to tell apart at first glance, because you are viewing it on such a small scale that the ppi is already so high in all cases. Same idea with EVFs, the point of diminishing return is fairly low in terms of resolution and other qualities tend to be more noticeable. All that being said it's still a subjective thing, so if you can, best to see for yourself as you might have different sensitivities than myself or the next person.
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