The 360 version seems to be doing somewhat better comparatively than the PS3 version of SF4 based on these numbers don´t you agree?
There is not that big a difference between 28 k and 58 k if you compare it with other PS3/360 titles in the past.
The PS3 userbase compared to 360 is 3:1 in Japan while this game did 2:1 in favor to Sony.