By how much will Killzone 2 outsell Halo 3 ODST?

[richardhutnik]

halogamer1989 said:

star_city said:
i think most people in this post and website underestimating the power of hype.....killzone 2 might be system seller and also might just outsell mgs4 it has more of a appeal
halo ods is downloadable content right?
(the first halo sold off massive hype) keep that in mind

ODST is a reduced price disc.

 

Isn't it a stand alone expansion disk?  Comes with more content for Halo 3, but can be played by itself.