I tried a mirrorless. Have you?

KPM2 wrote:

BTW: something I could never try out with a mirrorless in a shop is: What happens when you use a flash ? For example you use the camera in manual mode and the flash must do the exposure for the scene (in a litt Illuminate room) What do you see in the EVF than ? Or with backlit scenes, where you use the flash for fill-light for the person in this scene....what do you see from the dark person in the EVF ? This you could ask your brother in law.

best regards KPM2

I do not have the Canon R camera in question. I own one MILC, a Nikon Z7 which is roughly same age as K1-II. My newest flash is Nikon SB910, which is 8-10 years old and not one of the newer units which may be more optimized for Z.  When camera is placed in M mode, and exposure set, the image in EVF does not change when turning the flash unit on or off. A guidebook from Thom Hogan also seems to suggest that the final image, simulating the additional input of flash, is not previewed in EVF. I have no knowledge on how more recent models of these MILC or strobes handle that pre exposure EVF scenario.

For your other scenario, when I place a window in background and use highlight weighted metering, the interior foreground furniture appears dark in EVF with flash on or off. The exposure of interior furniture is easily controlled with flash in final image, but is not evident in the preexposure EVF.