As I recall, all this started when I was in communication with Oppo tech support. Some Oppo users were complaining that their 1080p upconverting players were showing maximum upconversion to 1080i when connected to some "1080p" sets. They said that a number of advertised "1080p" sets really only support 1080p/24 or in some cases do not support 1080p at all.
So anyway, I started engaging Sony Tech Support on what the XBR2 really supports, and two different reps basically said "sorry, the XBR2 isn't really a true 1080p set in spite of what the manual says and in spite of all the advertising". My sense was that if two independent Sony tech support reps come to the same conclusion about their own set, that ought to be better than any contrary opinion from Home Theater, Sound and Vision, CNET, or anyone else. But that was just a guess.