It seems like an amazing phone, but it's mostly geared towards the people who don't have the s3. At this point, it's definitely superior to the iPhone. I'll upgrade to the S5 on my upgrade in a year...
Samsung has accomplished with all its bells and whistles, that it's not the Android, it's what's running on Android.
They get you used to glitzy features, so you buy another Samsung on your upgrade. They are getting all the LG customers and some from HTC and Apple.