RustyBug Offline Upload & Sell: On
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Interesting points regarding the microcontrast as a component regarding tonal transitions vs. edges alone. Also, interesting, the credence to Zeiss in similar regard (albeit diff from each).
The point about the brightness of the viewfinder being independent (decoupled) of the lens ... kinda hard to realize the difference just from reading about it. But, recalling how much less I liked the VF when going from my FE to digital ... that was based on the change in the mirror transmission of light, i.e. less light by a factor or roughly 1/2 ... enter possible epiphany regarding RF. 
By that, I mean ... if one is shooting with a lens that is say f/2, the amount of light that reaches the mirror is 4x less than the amount of light that would reach the mirror if the lens were f/1. THEN, reduce that amount by the dlsr mirror reflecting only 1/2 of the light reaching the mirror, and you are effectively receiving 3 stops (8x) less light to your eye than what your eye receives in ambient vision. Shooting with f/2.8 (common pro zoom's), then becomes a 4 stop difference from ambient by the time it reaches your eye (brain) on dslr. Hmmm, how's that for a reduction in signal? 
Using an RF viewfinder, the light reduction from the lens is not encountered. The light reduction from the mirror transmission (1/2 split to AF module) is not encountered. Granted, the magnification of the lens is not encountered, either ... BUT, if one does have the ability to visualize the composition in their mind before, then along with the framing lines, should be of little adjustment / temporary perceived limitation.
So, where an f/2 lens effectively incurs a 3 stop loss of light to your eye ... ding, ding, ding ... there's where the the RF can help you to see better. Literally, you can see better because you have more (and nearly the same as ambient) light coming to your eye. So, it would seem that where some of those BOLD STATEMENTS about the RF ... well, there may be some merit here.
The point that you can use manual focus on a DSLR (which I do) as you can with an RF ... that is certainly valid. Personally, I prefer to use manual lenses with aperture rings where I can focus wide open, then "count clicks" to set aperture for exposure. I prefer that over trying to read the aperture in the viewfinder (which takes me away from comp), or looking at top plate info, etc.
But, the realization that there would be a 3 stop gain in light transmission to the eye (brain) for an f/2 ... well, that now makes for a meaningful difference (at the expense of no TTL magnification). In other terms, it would be like shooting on a dslr with an f/2 at f/5.6 and viewing (focusing) it stopped down vs. wide open (3 stops less light to the eye) and trying to manual focus. Yes, our eye (and brain) can accommodate through pupil variance (which also influences visual acuity). Which one do you think you could focus more quickly (with dslr) ... f/5.6 or f/2? This is of course only in regard to amount of light to your eye / brain differential.
The other differential in play would be the difference between using ground glass or focus confirmation electronics in dslr vs. the "single image" confirmation in RF.
So, when the statements get made about the RF forcing you to see differently, etc. ... umm, (on paper, so far), it would seem that seeing with more light, and seeing the "single image" alignment could indeed be a different visual experience from manual focus on a dslr. Of course, that has been in reference to using dlsr OVF (EVF being yet a diff matter).
So, if my (hypothetical) dissection of the (functional) difference is fundamentally flawed, please advise. But, (as a non-RF user) I think that so many times we hear the bold statements made about the RF, yet they ring as being rooted in mere preference ... mostly touting the ability to see outside the frame for greater awareness, or somehow magically making you "see better" etc. I don't think I've ever heard anyone explain or reference the amount of light gain / loss to the eye (brain). With a greater light signal to the brain, then I can deduce a greater responsiveness ... I mean, (quite simply) how responsively I can drive in the dark (even with best headlights available) is different from how responsively I drive in the light. Increase signal, increase response. Fundamental physiology there ... hmmm. 
Interesting ...
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