While Android fans (fandroids!) will pooh pooh the iPhone 5S as an incremental enhancement, I actually appreciate Apple's consistency in form factor. It allows me to use and reuse some of my favorite cases and accessories. Specifically, the luxurious leather cases from Mapi.
The latest Mapi case I was able to get my hands on is their Fashion Poros Slipcase ($55). It has the buttery-soft leather Mapi is known for, with a twist: There is an opening where the caller ID info is displayed, so you can see who is calling before you remove the phone from the slipcase. And when you do remove it, there is a clever mechanism that makes it easy to eject the phone.
The Poros case is available in raspberry or lime, and apparently targeted at women who would slip the phone in their purse. But I like it too! I'd like to see a case in their more neutral brown, tan, and black colors.