What
The S4 introduced a 1080p screen over the S3's 720p. The S4 is thinner and lighter than the S3, but the S4 has a larger better battery than the S3. The S4 has a better camera over the S3. The S4 has 2gb RAM, the S3 1gb.
The iPhone 5 and 5S will share the same small size screen, the same thickness, overall will look identical to each other. Sure the 5S will have better internal hardware, but that's a given.
Point is, the S4 to the S3 is a bigger upgrade than it looks like.
Don't care about the next BIG phone from samesung. This thread is about the iPhone 6. I can't believe people seriously walk around with the giant things as phones. I saw someone using a note 2 as a phone. Looked absolutely ridiculous. Like using an ipad mini as a phone.