PenTileで我慢する理由は青ピクセルの寿命の問題らすい
http://www.itproportal.com/2012/05/14/samsung-galaxy-s3s-pentile-display-long-lasting/

"Philip Berne from Samsung recently explained why the South Korean manufacturer still employs PenTile technology.　He explained that the blue subpixels on the RGB AMOLED displays are deteriorating at a fast rate.
This happens faster than that if tge green and red subpixels."