iPhone works 100% well, what is it on the S4 that one will use on daily basis? being realistic...I have used the S4 for a few days and there was nothing special that I needed which I couldn't do/use just as well on the iPhone 5.
Few things that probably will never change about Android operating phones:
#1 - Bloatware - Insane amount of it (Disabling is it not the same - it should not be there)
#2 - Bloatware - taking up huge chunk of the RAM & storage - no wonder Android phone manufacturers keep bumping up the RAM - but guess what...Carriers are dumping more and more Bloatware to fill that "Extra" RAM....
#3 - Samsung has no innovation - throwing a bunch of features together into all sizes one could possibly think of is far from innovation - Also Android has too many accounts - realistically try using a android phone and see how much you truly have to setup before you are fully able to use the phone without doing a single additional thing..(this goes out to users who actually use their phones for more than just talking and playing games)..iPhone - One iCloud account does it all - add additional email accounts and thats it...Also on Android...Every App you download asks for "Access to phone calls, emails, sms" Why? (That also answers your security question...Muck like how Windows come pre-installed with Anti-Virus, Android now too comes pre-installed with Antivirus...iPhone - doesn't need one...Mac OSX - Doesn't need one - because the security is part of the OS's secure design from the ground up.
Gestures - How many gestures can one possibly do on a ~4" Screen? cant possibly put your whole hand on it unless your a 2 year old...iPhone offers 3 finger (maybe more? - I'm not sure) and I'm sure most people have never had the need to use more than two fingers on a smartphone....Samsung offers great (unnecessary) features but are they truly working at best each and every time? Sadly after playing around with a S4 for a few days nonstop, I can't confidently say that.
MultiTasking - personally iOS offers the simplest form of multi-tasking (You click twice - boom switch between apps....can it really get any more easier than that?)
Camera - iPhone has great camera, Samsung S4 has great camera, if we are going to compare camera...I think the HTC ONE (M7/butterfly) has the absolute best camera - that too in a 4MP - Like apple once said, its not just about the megapixels that matters, its the software that drives it. I would say iPhone 5 and Samsung S4 (& even Note II) are not any different in quality - HTC ONE definitely taking the lead..and then there's also the Nokia Lumia 1020 with its camera ---- whole new ball game.
What android has better at the moment - Google Now - the voice assistant is extremely accurate when it comes to recognizing phrases/sentences - Hopefully the Siri in iOS 7 final release is as good.
just my opinion based on people complaining about iPhone lacking features...btw how many "features" do windows phones have? Lumia & all other windows phones don't have anything thats innovative in that sense...yet people still like it...and they like it for its simplicity from what I have personally heard.
I wish Ubuntu Edge was successful, that OS would have put Android at the back of the line.