yeah i get what you mean. inFamous does look amazing. KZ seemed more "polished" to me than "detailed" for a next gen game. I think meeting a next gen launch timetable must be one of the most difficult developer milestones to meet.
Surprisingly, I've still been able to stave off the "new toy" urge on getting a PS4 and was going to wait until the release of MGS V but I"ll be damned if I wait until the end of next year. Destiny and Watch Dogs look to be system sellers to me. Even inFamous but I'm going to sit it out on the sidelines and try to play a demo unit before I make any decision. Although it hasn't been announced, Mortal Kombat is getting worked on (zomg) and I'm really interested in how it would turn out on a next gen platform.