Got 4.4.2 yesterday on my Sprint GS4 and I've been enjoying all of the upgrades.
For one, everything seems to be much smoother (especially web browsing), the lock screen music controls have been redesigned, the keyboard now actually has an animation, and the screen fades off when the phone is locked.
Unfortunately I've noticed a whole host of problems. First off, widgets now freeze up like they did back in 4.2 (widgets like clocks will freeze in place, warranting a restart), I can't download anything to my SD card (even though I have 5GB of free space, it says there isn't enough room), the new keyboard animation is a bit glitchy, and all of the default black menus "smudge" horrendously.
Overall, a decent update. The only thing that pisses me off is not being able to download anything to my SD card. Battery life is the same as before, so that is always a plus.
I use Nova Launcher Prime, so I wouldn't have taken notice of any Touchwiz changes with this update.
Posted via Android Central App