Display: Many people complain that this 4-inch retina display offering is joke when compared to what other manufacturers offer these days. But this is not a phablet; it’s comparatively much easier to use with one hand and the color tone of the 5S is much better than the overly saturated displays on the Galaxy S4 and Galaxy Note 3.
Processor and RAM: The 5S has only 1GB RAM and a Dual Core processor which seemingly pales in comparison to what other flagship phones have to offer. But if you are a serious buyer, don’t be fooled by these specs because the iPhone 5S is actually "The Fastest Phone ever tested" till date. The reason why the iPhone 5S blows away the competition is because it’s processor is made specifically for the phone and it utilizes and squeezes processing power in the most efficient way unlike other phones whose processors are generic and used across various manufacturers without really utilizing available power to it’s full extent.
Camera: The 5S has a excellent camera but it is not the best in the market.
Call Quality: Normal calls are just as good as any other phone. But not many people are aware of the new facetime audio HD calling feature across iOS 7 users, the clarity is almost too much! You can even hear a person swallow or smack his/her lips. Little too intimate if you ask me:-)
Special Feature: Fingerprint Scan and unlock your phone. People may argue over the pros and cons of such a feature but I would personally prefer such a feature which I will certainly make use of; instead of an almost useless fancy feature which I rarely use.(Eg: Touch to share)