This great news was sent to me by Barry Traylor, who found it at Box Office Mojo:
Despite the muting effect of Christmas Eve, True Grit posted the top-grossing opening weekend ever for a straight-forward Western, capturing an estimated $25.6 million on around 3,900 screens at 3,047 locations. It was also the biggest launch of the Coen brothers' careers, passing Burn After Reading. With a $36.8 million tally in five days, it's already the highest-grossing Western since 3:10 to Yuma (2007), which started much lower and earned $53.6 million in total, and its five-day attendance was in line with Unforgiven's. According to distributor Paramount Pictures, 65 percent of True Grit's audience was male and 70 percent was aged 25 years and older.