As mentioned earlier I had a Samsung LN52A850 which had serious IR interference issue, so I did a return, buying the 52XBR6.
The Sony has a very good picture, but the Samsung has a deeper 3D like picture that really pops. I think the reason Samsung has a deeper more 3D like picture is the clear shiny plastic cover on the screen.
The matt screen on the Sony, shows almost no outside reflections, the Samsung picks up a lot of reflection from windows and lights, most apparent at any angle other than straight on viewing. The bezel reflections are about the same on both sets.
Initial impression, the Sony renders true color better. The Samsung colors are not quite as vivid, whites tend to blow out ( high contrast, even on standard setting). The color issue I am sure could be resolved with calibration on the Samsung, the settings are really maxed out from the factory. The verdict is still out on black levels, I have only had the XBR for a couple of hours.
Sony provides better sound from the cabinet speakers than Samsung. Samsung has two down firing speakers, which sound a bit tinny.I run my sound thru an A/V receiver so that was no big deal.
No IR interference issue from the Sony. The Samsung blocked my satellite receiver and some functions on my AVR. I could by pass the satellite issue by going to UHF communication, not so lucky with AVR.
I miss the real pop that the Samsung picture provided, honestly best picture including Plasm I had viewed. I have 30 days to decide if the XBR6 will stay or go. I will not rush to judgement on the XBR until I have had some time to view and make adjustments.