Lol, yeah that's the thing when your running a manufacturers version of android - the changes are much less apparent.
The difference between JB & KK were much greater on GE devices due to ART and of course the Google Experience Launcher - as well as refinements to stock dialer and such.
All of those have zero relevance on Samsung's 4.4.2 Touchwiz as you don't get ART support and only have access to GE launcher by side loading it - and likewise stock app improvements have no relevance as they are not on the S4 / Note 3.
The next time you'll notice a difference is if samsung port the new touchwiz over to the Note 3 & S4 - otherwise it's pretty much going to be more of the same no matter what updates you get going forward.