The EVF is not as good as that in the a7/r - which is good, but still improvable. I'm OK with either a very good EVF or OVF.
I think tolerance for EVF's is a very person-dependent thing. I find even A7R's EVF to be intolerable, and my dislike is not due to the lag or refresh rate but color. I found the EVF color to be too lumpy, warm, saturated, and cartoonish. There is a temperature adjustment; however, when I adjusted it cooler for some parts of the frame, other objects then became too cool, and all this changed with slight change in available light/type of light, being worst indoors in evening under mixed light. I would say dump the EVF and lower the price, but the problem is the rear LCD is not viewable in sunlight