Benny's is good (I was there on Pride Sunday), and Chipotle is good (I eat there almost once a week during work shifts), but I wouldn't call either SF burritos. The difference, I think, lies in the saturated rice and beans that complete the SF style, vs. the lime-sprayed rice (seriously - I've watched the spraying) and anodyne salsas of Chipotle. Even worse is Qdoba, which seems to have set as a goal being the B- to every Chipotle B on the report card. After 7.5 years in NYC, I still have not had what I would call a "San Francisco" burrito here.