How do others find Tivo HD’s picture quality compared with a direct source or other HD PVR’s?

I recently moved to Tivo HD from a Beyonwiz PVR. While the UI of Tivo and the EPG is far superior I believe the image quality ‘outputted’ is inferior to the Beyondwiz; simply the HD picture is not as sharp and clear (both use 1080i HDMI fixed to TV)

How can this be quantified technically? EG How loosy is the compression used by Tivo compared with the Beyondwiz ? Bit Rate? Impact of Tivo encryption? And whatever else influences picture quality.

I understand a number of factors influence the final image quality (particularly the actual broadcast/source); however the Beyonwiz is consistently better.

I would like to believe this is all in my head; but can’t continue to ignore it..pls help I’m considering plugging the Beyonwiz back-in and selling Tivo :-(

AJ