I'm talking about the J cabin and yes compared to the LAX and JFK based crew the SFO crew is more senior
SOURCE: American Airlines Flight Attendants: I happen to know several personally. SFO is a more senior base, old flight attendants.

But on another note... and this info is from an American Airlines source.
There is a rumor that the SFO - JFK route will have a change of equipment to a 2 class service, that the A321T will only be LAX - JFK. I was told this today on my LAX - JFK flight that it has been thrown around to end the trans-con service out of SFO. I hope this is nothing but a rumor. Additionally there is going to be a new caterer, a less expensive (CHEAPER) caterer.

The warm baked cookies tonight were burnt, and hard as a rock.