Sonic wasn't Nintendo but at least he had a history of being the company's rival and getting a lot of Nintendo-exclusive games. Sonic has hardly any association with Playstation, on the other hand. None in fact. Big Daddy and Dante have at least had noteworthy or will have noteworthy Playstation games. (This Dante much less, but hey. He did have PS2 games.)
Other than Sonic Rivals? Not really. Two games out of much more aren't really worth justifying him as an important playstation character. He's always multiplatform, but leaning torward Nintendo.