TV is a Sony KDS-55A2020 SXRD RPTV 1080p/60. (one model before they became 24 fps capable)From a geek, yep your wrong.
1080i to 1080p is not just doubling every other line. In must be de-interlaced, which the TV may or may not do correctly.
720p to 1080p is simple scaling.
I'll try 720p.....but I'm still skeptical.