Just my opinion, but the CX-5 Reserve/Signature will easily make its way onto a lot of buyers' short lists. It offers so much value. On the other hand, the CX-9's competition is a lot stiffer, especially with the Korean twins in the mix. Interior quality (and maybe tech?) is arguably better in the Korean models, and some of the competition offers more powerful drivetrains (and more cargo space), like the Pilot/MDX, which is a full second faster to 60 than the CX-9. Personally, I'd still drive my CX-9 over the Telluride/Palisade/Pilot/MDX, but it would be a much harder decision than, say, choosing a CX-5 Reserve over an RDX, Q5, CR-V, RAV4, etc.
Some other points to consider - The CX-9 and it's competition all get less than average gas mileage (minus the Highlander Hybrid). On the positive side, the CX-9 (in my experience) does not seem to suffer from the boost reduction issue as much as the CX-5 Reserve/Signature does.
Have you driven the CX-5 Signature? The nappa leather is supposed to be more comfortable than the leather found in the Reserve. It's possible that the seats will wear in better compared to the Reserve's seats.