You can not compare Killzone and X. Killzone:Shadowfall is a cinematic corridor shooter, you can not jump of the helicopter and run through the city. X is an open world game where you can go to every location you see.
If nintendo would make a killzone like game for the Wii U the graphics would probably near Shadowfall quality. Perhaps the new game from retro will show that.
And I remember Sonys fake Killzone trailer for PS3 ...











