I'm on AT&T. I heard there's an update for the GS4 now. Wondering if someone could compare the fluidity and lag between the two. I know before the update, it had some lag though things that it shouldn't and it used more RAM than it should have. (I own the iPhone 5 btw) Also, could someone post pictures of both displays in sunlight? Maybe at 50% and another at 100% brightness? I would greatly appreciate it. I'm considering the GS4 but I'd be buying off contract so of course I would like to know these things before doing so. Thank you in advance!