Odd, I've never thought V4 looked unrealistic.  If anything, I find her much more realistic than V3 because she's so much closer to average proportions out of the box than V3.  IMO V3 looks very much like an attempt to capture the essence of the fashion model, and V4 looks like the girl next door type.

She does have proportions more similar to A3 than V3 though, at least from the neck down.