Compilation of pro cyclist fit information from published data dating back to 2006 from various online publications (click to enlarge):
The chart is based on a sample size of 192 data points for saddle height and 189 data points for reach. The equations shown are for the linear best fit line, and the dashed lines represent plus/minus 3 cm. R-squared is the coefficient of determination as calculated by Excel.
Below is the same data, but instead of individual data points, a "three-point running average" was taken: