[zippyneedsawin]

I'd say Shuback sums it up pretty well in his column when comparing 'Z' and Goldikova on drf.com:


Both Goldikova and Zenyatta won five Group or Grade 1 races in 2010, but there is little resemblance in the quality of the fields the two were beating in those races.

In her four Group 1 victories in Europe and her Grade 1 Breeders’ Cup Mile triumph, Goldikova was beating 16 winners of 37 Group or Grade 1 races. The overall Group/Grade 1 record of her competition in those five races is 157-37-25-19.

In her five Grade 1 victories this year, Zenyatta was beating not a single Grade 1 winner. The overall Group/Grade 1 record of her competition in those five races is 28-0-1-2. Moreover, Zenyatta beat just two Grade 2 winners in those five races, St Trinians in the Vanity Handicap and Switch in the Lady's Secret.

In fact, while Zenyatta’s five victories this year were all technically Grade 1’s, the quality of the competition indicates that they were no better than Grade 3’s.

http://drf.com/news/goldikova-rules-world