It's funny you bring these up... MAC (Military Arms Channel) on youtube literally made a video discussing how he was using both of these but was currently using his p-01 omega more due to the availability of night sights. I think he really liked both and they seemed to be interchangeable to him, but since at the time he made the video the Sphinx did not have night sights he was carrying the P-01. I believe he used the term, "functionally they are nearly identical" Here is the video: