a sharp 70" led/lcd is about $500 more than a panny4000... Figure cables, install mount, screen (even DIY screen) and everything thing else about light/reflection control, and it's about a wash.
The sharp is direct view, as much contrast as can be measured... as big as most reasonably need in a multipurpose room / theater.
Yea, I know dedicated theaters need 100-150" or more... I'm just sayin.... direct view is getting bigger/cheaper by the day.