When the Broad Museum opened in September, it helped solidify L.A.’s reputation as one of the art capitals of the world. Now there are two new galleries to add to the mix: Sprüth-Magers Gallery opened last month across from LACMA with a solo show of new work by John Baldessari and later this month, Swiss gallery owners Hauser and Wirth and former MOCA chief curator Paul Schimmel are slated to open a downtown Arts District spot.