So this shootout has only confirmed what I believed about the new display in the GS4. Is one heck of a display. Incredible color accuracy. Interesting that auto brightness increases the screens brightness beyond what is possible from manual setting it. So basically in bright sunlight, set it to auto. I've never use auto, so I'll have to look into this when I get my S4.
http://www.displaymate.com/Galaxy_S4_ShootOut_1.htm
http://www.displaymate.com/Galaxy_S4_ShootOut_1.htm