Not the sellers seat, but here is stock:
And my Corbin:
The Corbin's are about an inch shorter for the rider and maybe a little taller for the passenger. Much firmer padding, but shaped better. It allows me to touch both sides more easily with my 29" inseam.
I have not tried a Sargent, but can say the Corbin is a great seat. If you plan on doing lots of 400 mile days, maybe a Russel is the way to go, but if you are doing long days only on occasion, then a Corbin would be fine.