Test is flawed since S3 has a low max brightness compared to iphone 5 brightness. The S3 is very dim.
I don't know why people care so much about how dim the s3 screen is. Most of the time I only have it on about 30% and that's plenty bright.
If it is really sunny I'll whack it up to maximum and using it isn't a problem. Sure it's not mega bright, but what's the big deal?