Originally posted by bertwert OVF is better until they come up with an EVF with same resolution as the sensor
like an ovf has decent resolution? no... the ground glass that's used for focusing destroys the picture quality; replace the screen with something that's usable for manual focusing and you've darkened the ovf and lowered the p.q., because of the increased roughness of the ground glass... been there done that with the k10d, it sucked, and it was never useful for accurate manual focusing.
evf is superior because it has wysiwyg and it has magnification; the only time that there is lag is in dark conditions that render an ovf basically unusable.
when i mount a flash on the a7r, i can see the effect that the flash will have on the shot, in the evf, because the camera takes the additional light into it's evf display calculation... you can't do that with an ovf.
the list of evf benefits over ovf is long, and most people who take the time to learn evf never want to go back to ovf.
that's why the rate of mirrorless growth has been so much higher than that of dslrs.