I think it just really depends on who is doing the recruiting. Firms generally, but more importantly, recruiters and hiring committee members, may or may not care about "pedigree." For the last few years at my firm, the people in charge have emphasized ivy league undergrad paired with T14 law school. It seems these are the 1Ls we invite to firm events, etc. w/ the hope that they'll come back to interview as 2Ls.
Does it mean these people automatically get jobs here? No. As we all know, going to HYP means almost nothing when it comes to law school grades. Grades and journal membership are the great equalizer/
(caveat - I'm not on the hiring committee, so this is my understanding from convos w/ hiring committee members, our recruiting staff, and observation on who we give SA offers to).