...Bon Iver, apparently.
This, er, honour was bestowed by LA Weekly. Justin Vernon's nom-de-plum managed to beat out TuneYards (#2), Arcade Fire (#3), Bright Eyes (#4) and MGMNT (#5).
Other acts in the top 20 include Sleigh Bells, Decemberists, Black Keys, Pomplamoose (HEY! Wait a second!) and Death Cab for Cutie.
From the introductory paragraph:
On its surface hipsterdom seems to be an individuality-grab, but most of today's 20 and 30-something bands from Silver Lake and Williamsburg sound shockingly similar. They're all playing variations of retro garage and soul music -- or bringing glockenspiels and choirs on incestuous nationwide tours -- all the while clad in vintage garb likely infested with lice. We're not saying that they should be outlawed by, like, Congress or something. Just that they should be avoided.