TeamSpeed wrote in post #19011931
Some counter points...
Actually low light focusing is easier with mirrorless EVF. Both being able to see the scene to put an AF point on what you want, or manually focusing.
The issue for some folks is the instantaneous acquisition of focus, reliance upon the speed of AF. Many will tell you the AF on the mirrorless hunts in low light, and since IR focus aids don't work, during wedding receptions they cannot grab focus, but miss shots. So they pick of the dSLR so they can use the IR focus assistance of the flash unit.
Using the more brightly lit view of the scene on EVF, and reliance upon MF even with focus peaking is still a bit too slow, compared to AF.
TeamSpeed wrote in post #19011931
Battery life seems to be about the same on my R as it is with my 5d4.
Good to hear battery life is pretty good. If a camera did not rely upon EVF at all, and it was otherwise similarly frugal with battery power, you could get even MORE shots with it...that is what I meant by inherent advantage of a camera not reliant upon EVF,
TeamSpeed wrote in post #19011931
EVF is approaching 1/20ms on good advanced EVF/mirrorless bodies
Once EVF are 4k or better with around 1/10ms refresh with lower power consumption, the disadvantages shrink greatly. I suspect we are about 3 years from this type of advancement.
20ms as a 'refresh time' is still only 50 fps, 10ms as a refresh time is still only 100 fps...I suggest double checking what you might have misquoted.
Even the slowest EVF today is 60 fps refresh of the screen. The fastest EVF refresh rate today is currently 120fps, as it is in the Sony A9.