I have both. I preferred the Sargent initially, but after a while it broke down enough that I wanted something more firm. I got a Corbin. I love the workmanship of the Corbin, and the leather, but hate the position and contour. It is also a little too firm for me. If the contour was better, it would be fine.
I did many 1000 plus days on the Sargent with no issues. I could get off the bile and do it again the nest day, and often did. The Corbin makes sensitive areas hurt. I am going to send the Corbin in to be reshaped and will most likely have them replace the foam with their softer foam. The warranty the foam for life so they said they would replace it with the softer foam free of charge, only shipping. I believe I will then achieve seat nirvana.