Not an in depth analysis by any standards, just a quick look at Metacritic's list for each console so far.
PS4 has had 147 releases in 2015, with 67 of them getting a "Good" score.
XBOX ONE has had 95 releases in 2015 with 38 of them getting a "Good" score.
Wii U has had 22 releases with 11of them getting a "Good" score.
intrestingly the hardware sales numbers seem very much in line with the amount of sofware releases, what with PS4 outselling XB1 2:1, and Wii U by around 6:1.