I looked at an early Leicaflex at a camera fair in France several years ago, and am still trying to figure out the "aerial image" that it presents to the user. Different from a "normal" ground glass image - and brighter.
Thanks for your collected thoughts on the R6 shutter lag. I think it would bother me, the feeling that the camera doesn't react immediately when I press the shutter. My Leica RF cameras have spoiled me.