A super-fast 1.9GHz 4-core processor, which now eats more battery ?! Does not a man who was more than fast enough in S3. If you prefer working on the battery life, which is still a disaster.
The display is in sunlight and maximum brightness hardly read.
A 13MP camera that makes unusable photos at dusk and its memory size now is still unpraktikabler because the upload and send them by Bluetooth / Email now is even more complex.
Still slippery plastic in low-optics.
The operating system of the S3 is at the same level, as on the S4.
I can only recommend to anyone wanting a Samsung smartphone would call his own to pick up the S3. Costs half and has in practice the same.
Samsung has improved its strengths unnecessarily and is not addressed the vulnerability.
I'm going to the HTC One and the upcoming Nokia Lumia 925 test and then make a purchase decision. The S4 nobody needs.