http://vgchartz.com/hwlaunch.php?cons1=XB®1=All&cons2=PS3®2=All&cons3=X360®3=All&weeks=156&weekly=1
There is the comparison of the 360 and the xb from launch each. Notice how the 360 is doing better with a worse launch. However that being said I don't think it will reach 40 mil but it's too soon 2 tell there are still another 8 years in this gen for the 360 and with E3 around the corner who knows.\
If PS3 by some miracle made a PS3 slim and lowered it down to 299 they would win the console wars so easly and all hope for the 360 would be lost.