It took me awhile to hunt down a refurbished Sony BDP-S790, the discontinued Blu-ray player which has 2 HDMI outputs. The model that replaced it, the S7200, only has a single HDMI output making it useless for my specific requirement, which is outputting the video directly to the 65X900A for Blu-ray 3D support and outputting the audio to my older Denon receiver which only supports HDMI 1.3a.
The interesting thing about the 65X900A is that it is a 4K Ultra HDTV which utilizes Passive 3D, not Active 3D. Because the panel has twice the horizontal and vertical resolution of a 1080p TV, it's possible to simply use a polarized filter and display the left and right eyes as interlaced lines on the 4K panel. There are 1080p TVs which use Passive 3D but naturally on a 1080p TV, the 3D resolution is halved to 540p delivered to each eye. This TV delivers full 1080p resolution to each eye in Passive 3D, making it the absolute best solution available for displaying Blu-ray 3D because there is no need to display 2 frames in 1 synced refresh like Active 3D, creating crosstalk and reducing brightness by 50%. Furthermore, there is no need for fancy Active 3D glasses which must sync with the TV and have batteries which die. It's essentially 100% identical to the movie theater 3D experience, simple passive glasses with a polarized filter, a simple polarized filter overlaid over the X900A's 4K panel, and the TV just displays the left and right eyes at the same time by interlacing the frames.
I spent about 30 minutes watching the opening sequence of Avatar and it is absolutely the closest I have ever been to the 3D cinema in my home. There is no stereo crosstalk at all. There is no loss of brightness, and this is especially painful on 3D plasma TVs because of the ABL just breaking 3D playback. The 3D on my VT60 constantly had distractingly fluctuating brightness because of the ABL always kicking in, plus it wasn't full 1080p resolution since Panasonic opted to halve the chroma resolution in 3D.
It's too bad that Blu-ray 3D is already dead, because I've just experienced what 3D home cinema was supposed to look like and it's amazing. I have a few Blu-ray 3D movies kicking around I slowly collected on sale like Pirates of the Caribbean: On Stranger Tides and I can't wait to watch them the way they were meant to be seen. I was never a big believer in 3D home cinema because of all the compromises that had to be made compared to 3D in movie theaters, but the real Blu-ray 3D experience is really just like the 3D in a movie theater. You just needed the right TV, and sadly no one ever made such a TV until the Sony 65X900A.
Note that the step-down 55X900A does not have full 1080p resolution in 3D mode. The 2014 B models use Active 3D for some stupid reason except the jumbo-sized 79X900B which uses Passive 3D, so sadly only a few people will ever be able to experience 3D the way owners of the 2013 65X900A will. Maybe LG will come through and implement Passive 3D on their upcoming 4K OLED TV, that would just be amazing.