EVF are hopelessly bad. Still laggy. Yiiiiikes.
I'll take the tiny Rebel pentamirror any day over the EVFs available today.
The latest Olympus EVF has a lag of 0.016. (16 milliseconds). I wouldn't call that "hopelessly bad."
Even if it were true (I think it isn't), that's still hopelessly bad. It needs to be under 5ms for all lighting conditions, preferably closer to 2ms.