Mirror up or not?

Is there really that much perceivable difference in sharpness when using mirror up?

Image degradation due to mirror slap usually occurs between 2 second and 1/30 second shutter speeds. Faster shutter speeds are too short to be effected by the slap of the mirror. Slower shutter speeds are so long that the vibrations caused by the slap of the mirror effect only a small portion at the beginning of the long exposure.
 
Just tried it on the F, you need to set the MLU button to up, mirror is still down, press shutter/take picture, mirror stays up, take as many shots as you want w Mirror up, then when done, turn button back to Mirror down and Mirror pops back down and you can see again

In practice , I've not used it on the F

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