The way I see it, this is sort of the Timex vs Rolex debate. Either will work well, but the former may be off by just a hair you won't even notice.
That the Sphinx is well made is a given, but that it's higher quality translates into an on-range advantage over Pistols of lower price point, is doubtful.
I get along just fine with my Tanfoglio, Canik, and SAR Pistols, and they produce all the accuracy and reliability I could ever want!