Yes. Some of the data I quoted came from Kasson's blog. I have an X-T3 but typically use the mechanical shutter for stills. When I have some time I'll do some e-shutter testing on my own. I'd always assumed I wouldn't be happy with the results but I think I'll find out for myself.This subject also interests me. I assume you've also come across Jim Kasson's blog where he tests cameras' e-shutter readout speeds? Because of its e-shutter performance (and because it's less of an investment than an a9), I have contemplated getting an X-T3, though ideally, I would love to purchase a Canon system with an e-shutter speed fast enough for normal, non-action use without artifacts. Shooting stills on movie sets (where being silent is mandatory) without needing a blimp, that's the dream for me.
Video rolling shutter performance in the XT-3 is quite good. If you can live with the smaller sensor it's a great camera. Whenever I pick up the 1DX2 after using the Fuji for a few days I'm confronted again with how loud the mirror/shutter mechanism is. I won't miss that.
Edit: I know some folks around here aren't going to want to hear it but I find very little difference in IQ between the X-T3 and the 1DX Mark II. The colors and rendering are very different and the 1DX2 is still a little better at high ISO but they are fairly equivalent IMO. The 5D Mark IV still has a significant IQ advantage as you'd expect.