There's a few things that determinate EVF quality and experience:
- number of dots - this is the spec we see everywhere, but is far from the only metric that matters.
IME it matters very little. Improvements can help a bit for precise manual focusing, but other than that, all of Fuji’s EVF panels have more than good enough resolution these days.
- magnification - to what extent is the EVF screen is enlarged by the optics. Smaller bodies like the X-E5 have a smaller magnification as they can't fit larger optics and EVF. It's 0.62x for the X-T30, X-E5, X-T50, X-S20.
This needs to be multiplied by the actual panel size, though: you can’t consider it in isolation. For instance, the X-Pro3 and X100V/VI EVF has lower magnification than the X-E5, but it’s a larger panel, and the net result is a larger view. For me it’s the combination of these two things that constitute the main factor in EVF experience.
- eye point - longer eye point makes it more comfortable to see the EVF if you wear glasses. This is a spec that's rarely mentioned. It's 17.5mm for the X-T30, X-E5, X-T50, X-S20.
Yes, this is a really important thing if you wear glasses. It’s generally not an issue if you don’t.
It may be worth considering other things such as colour reproduction, contrast and gamma. I’ve used some EVFs which bear no resemblance to the recorded tones—I seem to recall a Canon one which was way too contrasty and made all the shadow tones pretty much black. But I’d say all Fuji’s EVFs are more than adequate on this front.
