I've used an iPhone 4 the past two years and an iPhone 5 for a couple weeks before I returned it. The brightness is definitely not as bright as the iPhone when both are set to 100%. The colors on the Note 2 are more vibrant and pop but depending on what you're looking at, it may not look as natural (skin tones). This can be adjusted by going into settings and changing the displays default setting (standard) to the "natural" setting. I've only noticed a slight hint of blue on screens when white is the dominant color on the screen (tilted at certain angles). Otherwise, don't notice it. (probably has to do with the non-pentile display). Speaking of whites, whites aren't as white compared to an iPhone screen but the blacks are amazing. For a screen this large, everything is sharp and crisp. Haven't noticed any type of jagedness whatsoever. I prefer LCD screens over SAMOLED but the tradeoff in screen size is well worth it (comparing to an iPhone).
From 1 to 10, if an iPhone was a 10, SAMOLED on the Note II has to be a 9 - 9.5 to me.
I held off purchasing the GS3 due to the pentile display but the display on the Note II has been wonderful.
Here's a comparison between the GS3 and Note II displays.
http://www.androidauthority.com/galaxy-note-2-vs-galaxy-s3-display-comparison-rgb-pentile-121182/