I own P226's and an XD .40 S&W 5". Thus far, I still favor my Sigs. The XD is still pretty new to me. It feels good in my hand, but for whatever reason I'm far less accurate with than I am my P226s. Maybe I just need more time. I've also had a few jams with my Newer XD and have never had a jam with my Sigs.
I'll continue to work with the XD, but would I replace a Sig with an XD? Not at this time.