In my opinion, the best vacuum poses tend to be from the small breasted athletes. Bigger "chested" ladies have to heave them up put of the way, or just leave them in position and the pose is lost. This thread contains pics that make the point, but I guess everyone has an ideal on what looks good.
At the time of Kathy's golden era, your face had to fit even more than now, and Kathy did not place well against other athletes who were more marketable. She did win the natural contests easily, but they don't have the prestige or dominance of the sport that the IFBB / NCP does. She continues to place high in natural contests, even though her conditioning is not so exceptional as it was in the 1980's and 90's for obvious reasons.