yes the accent sounds southern, and of course the language has influence from all of italy and latin (and even french), but the structure and vocabulary is 'most' influenced by the rulers from Pisa and Firenze.
But like you say, it does sound pretty southern, po' nnapulitano..
The language does sound a bit southern ( I'm not an expert on Italian, but I generally can distinguish regional accents).
I thought the ethnically the Corsicans are pretty much related to Sardinians ?
