Gah, I keep thinking about the MPE65, it is a lens I have yet to try but is on my list. Nice shot with that.
So we have an esteemed member here on POTN that is saying the viewfinder blackout/Prev Frame during a burst isn't anything worse than a DSLR, and others that did video reviews just didn't know what they were doing with settings, etc.
However I don't think that member really did any kind of test where you have Servo AF turned on and have focus as your priority, the test was inside the house just moving the camera around. I would think 3fps with a blackout or previous recorded frame would break your ability to track a BIF, for example. What is the real world experience of this so far? If this is the case, that would completely eliminate this camera for any kind of small area focus lock I would want during any kind of action. Large objects like a car or runner might be different, but often I am either tracking a bird, or a player's head while others move in and out of the frame.
DSLR mirror blackout at 7 or 10fps is better to deal with than a 3fps burst where you cannot see what you are tracking a majority of every second.