The reviewer at High-Def Digest said the Avatar BD is best viewed zoomed to 2.20:1. Going to 2.35 crops some of the graphics, but leaving it 1.78 has the subtitles floating high in the frame, and the open matte has too little action in the top and and bottom of the shot.

Pioneer PDP-5020FD, Marantz SR6011
Axiom M5HP, VP160HP, QS8
Sony PS4, surround backs
-Chris