I just got my 805 yesterday. I love it and it is a great complement to my new Samsung HLT-6189S. I've been doing some tests for your curiosity since.
First thing I did is tested the video processing abilities out of the box with out going into the secret menu (AUX1 then power a split second later to access on the 805). I fed a 1080i component signal to my 805 and lo and behold, it was output over 720p HDMI. Standard definition content coming in over 480i component was de-interlaced to 480p. The conclusion I can draw from this observation is that the Genesis chip included in the 605, 705, and 805 can only output a maximum resolution of 720p and going into the "secret menu" only changes the standard definition (480i/p) up-scaling resolution. That being said, down-scaled content didn't look half bad on my 1080p Samsung DLP, but I'll stick to the 1080i HDMI output on my Motorola DVR.
Since I had an HDMI 1.3 enabled display with HDMI-CEC, I decided to test that. The performance was less than stellar. It seemed as though my receiver and my TV were competing to see who would be the master and who would be the slave in the control system. For example, hitting the power button on my TV shuts the TV and the receiver off but powering on either of them doesn't turn the other on. I could not get the receiver functionality to work on my TV properly despite following my manuals instructions exactly. It was nice seeing my receiver's volume show up on the TV's GUI, but otherwise, I'll leave the HDMI control option set to off.
Last and certainly not least, I tested the audio. I have a 7.1 Sony speaker system (their "higher-end" stuff, not old HTIB speakers or anything) in my family room setup where the 805 is. Formerly, the A/V Receiver in that room was a Sony STR-DG800 and man was this an upgrade. As stated previously, the receiver is rated at 130 watts per channel but it sounds like a lot more.I'll do my Audyssey calibration tomorrow, I don't have the time or patience to do it now, so I just entered in some basic speaker distances in the setup menu. It still sounded absolutely stunning in the 4 different test sources I ran. I listened to selected scenes on my Toshiba HD-XA2 from Cars (using Pure Audio and THX Cinema), Star Wars Episode III (Using Pure Audio and THX Surround EX), and The Matrix Revolutions on HD-DVD (Dolby TrueHD decoded to Multichannel PCM and sent to the receiver using Pure Audio and THX Ultra 2 processing). I also listened to the DVD-Audio DTS portion of the Beatles Love using Pure Audio as well as Neural THX and DTS Neo:6. In all of the sources and processing modes, the sound was accurate and immersive. I preferred the THX processing modes in all of the tests rather than Pure Audio or their Original Dolby and DTS counterparts because it seemed to fill the room more and gave me full 7.1 output. That isn't to say the other processing modes were bad, just I preferred the THX mode.
I hope that cleared up some questions. Like I said, I'll post impressions of the sound after I do the Audyssey calibration. I'll also snap some pics of my setup tomorrow Until then, I hope you all enjoy your new 805s (or mourning the lack of one