Is Ketosis really worth it?

I’m doing a dedicated, strict cutting phase for summer (aren’t we all?) and I’m using Fat Fast foods on a CKD schedule like Lyle M’s book outlines. Since a calorie is a calorie, will I somehow actually lose more fat, or spare muscle better, by eating at a 500-700 calorie deficit during ketosis, VERSUS eating the same 500-700 deficit on a diet that still includes healthy veggies, juices, etc. without ketosis? In other words, all other things being equal–high protein, EFAs, responsible training–will the presence or absence of ketosis provide a benefit I won’t otherwise have, if I were to eat at the same deficit anyway without going ketogenic?