A few points I'd like to make:
-the KDL-55HX823 is NOT a "High end" panel by any stretch of the imagination. It's a mid-range panel. This is something you could discover in 5 minutes with a PC and a Google search box- or you'd already be aware if you knew anything about HDTVs.
-your "pro reviewer" DOES NOT have a "low opinion" of the Sony panel. In fact, he's rather happy with it. Allow me to quote, directly from the article you link:
"SD processing left us without complaints – scaling was fairly crisp and clean, diagonal interpolation (jagginess concealment) was of a good standard, and the KDL-55HX823 successfully detected the most common Film-to-SDTV transfer cadences (for both PAL and NTSC) and rendered a jaggy-free image"
"Let’s start with the positives: Greyscale tracking (after calibration) was great, with the only uncorrectable problem being the common LED LCD problem of visibly blue (or purple, depending on where you’re sitting) tinted shadows. Measured Gamma (the distribution of light output from dark to white) was absolutely excellent, resulting in a picture that had a decent amount of “richness”. There were also no huge colour gamut inaccuracies, although the KDL55HX823 couldn’t fully saturate the blue colour, producing a slightly purple hue instead (again, something we often see with LED LCDs). All of these attributes afford the Sony HX823′s images a good amount of realism and depth."
"If we had to sum up Sony’s LCD (and LED LCD) output for the last few years in one word, we’d probably choose “decent”"
" If LED LCD is your thing, then the Sony KDL-55HX823 is one of many good choices in this category."
And right at the end of the article, this panel receives the "Recommended" award.
With the above in mind, I can only conclude that you are being deliberately deceptive and- dare I say it- dishonest in your choice of words. Your topic heading is completely at odds with the article you posted. Perhaps you'd like to explain this discrepancy?
I think the review is pretty thorough and it confirmed what many have said in this forum that the picture quality of plasma is superior than LED and LCD panel.
"Users who are concerned primarily with picture quality, and who want a large-screen display, are still better served by Plasma televisions from both Panasonic and Samsung, in our opinion. LED LCDs have their benefits, most notably their very low power consumption and ability to produce very bright images, but picture quality appears to be lower down the list of priorities with this display type"