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I have both.
The screen on the S3 is so much better.
I turned off the auto-brightness mind. I find it a little dim on the S3.
Whack it on manual, up the brightness and change the screen mode (colour/vibrance).
It's crystal clear and HD video looks fantastic
EDIT:
Something else which I find better on the S3 is the WiFi signal.
The phone's range is greater than the S2.
Is it a worthy upgrade?
I only want to hear from people that have had both please!
If your S2 is working ok, I wouldn't rush to upgrade to the S3. It's good, but it's not such a revolutionary leap forward as the S2 was from the Galaxy S.

Battery life is a massive upgrade from the s2
Samsung said wifi speeds should double too, have you tried a speed test?
Cool thanks, I still can't justify it at the minute as I'm not far into my contract. I might think about getting it when prices drop.

While I neither have an S2, nor do I currently have an S3, yet, I believe what they meant was that the S3 is a dual-channel wifi device. If you have a dual-channel router, you can utilize the 2.4 GHz Wifi band (that everyone uses) and a 5.0 GHz band (that not so many people use) and that will significantly increase data transfer rates.
My router is on the brink of death, so I'm excited to be getting a dual-channel router to support the S3![]()
