This is for a -6 and not a direct comparison to the -7 since the seats are slightly different.
I have had both the CA-1 and the Sportsman seats. I bought the CA-1 seats from CA and had fitment problems with the RV-6 (CA was great about the whole thing BTW). The fitment issue aside, I got to spend lots of time sitting in the CA-1 seat and the "loaner" sportman seats.
If you are a small/narrow guy the CA-1 will proably be just great. However, the CA-1 has smaller boulsters and is a good .75-1" narrower than the sportman and is not a good fit for bigger guys.
The CA-1 can be ordered with 1/2" layer of conforfoam and are very comfortable. The sportman is naturally thicker than the CA-1, but can be made 1/2" thinner if you need more headroom.
One thing I really like about the sportman seats is the square front edge (under your thigh) and extended boulster. The CA-1 has less boulster and a rounded front edge and my leg didn't feel well supported.
I now have a set of CA-1 seat backs with sportman seat bottoms and am very happy with the combination.