My Sargent was very comfortable until it had about 16,000 miles on it, then it got a bit uncomfortable. Of course to put it in perspective, it was still much more comfortable than the stock seat. I had a Sargent on my RC51 and it was very comfortable over long distances.
I bought a Corbin to try, for the most part to see if it would be cooler than the Sargent on long hot days, and it was. The position was horrible though, for the reason others have stated, it is dished so much that when you lean forward, you crush things you would rather not crush. (Proper motorcycle underwear and even riding pants were used, not animals were hurt other than the ones in my pants.)
My Corbin is back at the factory after about 11,000 miles for softer foam and a reshape. I am having the rear dished area filled in for a flatter seating area. For a larger person, with the accompanying larger rear, the dished seat may be fine, you would be lifted off the rounded nose area of the seat. I believe someone shaped like Kim Kardashian would have no issues with it. As a test, maybe Kim can take Bruce's jewels as a test and ride on the Corbin when he is finished with them.
I am really looking forward to getting my seat back. After a lot of thought, I think I figured out what I need in a seat.