Depends on how you run horror.
We,ve played a couple of sessions in Rune,s Cthulu game, and while I'm not familiar with the Chaosium game, it probably would have proved moot. Well over half of the game has been descriptory and atmospherically tense. I don't think we haven't even fought anything yet, but we're not in any real hurry to. The odds definately are not stacked in our favor.
We make lots of sanity checks, though. Lots.
From what I understand, the rules for sanity checks have not changed for the new edition, so if this is more to your style of playing and you already have the old version, you can probably have just as much fun with it.