I wouldn't call SATC an entity that's responsible for creating The Sopranos by any stretch. o my knowledge, the three most significant elements that went into creating The Sopranos were Chase's relationship with his mother, the Simpsons (Chase wanted the Sopranos to essentially be a live action Simpsons) and the self-conscious, hyper-sensitive, damn near hit dog way he felt many Italian Americans viewed pretty much anything mafia related in the media.

Just not seeing the Sex And The City vibe, unless you're referring to revolutionizing serialized television. I'd agree with that, though I'd say one is clearly the Alpha of the two on that front. SATC was pretty significant in it's own right and provided an elevated platform for television that catered to female and homosexual sensibilities.