Coincidentally enough, Avatar is the only major film to launch the same weekend as TFA did (third weekend in December) and have Xmas land on a Friday in recent times.
Here were Avatar's first set of Weekdays, followed by the second weekend:
Mon - $16,385,820 (-33.8%)
Tues - $16,086,461 (-1.8%)
Wed - $16,445,291 (+2.2%)
Thurs - $11,150,998 (-32.3%)
Fri - $23,095,046 (+107.1%)
Sat - $28,274,406 (+22.4%)
Sun - $24,247,681 (-14.2%)
Here is TFA so far
Mon - $40,109,742 (-33.8%)
Tues - $37,361,729 (-6.9%)
Wed - $37M-39M? (-1.0% to 4.3%)?