heh. noone biting eh? i guess i'll take a swing at this. my answers relate entirely to the practice of trial lawyering. i know relatively little about civil litigation.
the only people who ever do anything meaningful in a courtroom are small firm lawyers, PDs, prosecutors, city/state/federal solicitors, and senior members of big law firms. anything federal is highly competitive, and becoming a senior litigating partner at a large law firm is an incredible amount of work and luck. the rest will mostly be populated by graduates of whatever local school produces more graduates than the nearby larger firms want. In my state, there are only 2 law schools and both are public. the better school sends most of its grads to firms or out of state to nearby big cities. the worse school produces the majority of the trial lawyers in the state and the majority of the judges.
I think you would find that the number of people who spend a number of years as trial lawyers who come out of places like northwestern, chicago, cornell, and even wustl is going to be much much less than the same number from places like Chicago Kent.
of course, i'm guessing based on my knowledge of my local legal market. the city of chicago might be filled with graduates of the university of chicago who work as low level trial lawyers. probably the same number of graduates of harvard business school who manage grocery stores.
at the higher levels, large corporate lawsuits especially, very few trials take place. those cases almost all settle.