I Had the 55CX802b for less than a week and there were a lot of things I liked about it.
The TV looks good and well made, the rear layout with downward facing HDMI and network ports makes it good for wall mounting although if you use a slim wall mount bracket as I did you may need to modify the power plug that plugs in to the back of the TV as it stuck out more than the wall bracket allowed. The remotes were also good although the touch pad did miss the occasional thumb swipe it worked 90% of the time, I found it easy to use and it was my preferred remote. The Panasonic TV app was good for setting the TV up but I foundit quite fiddly and time consuming for normal remote use with having to swipe and move around several screens to get to the function you wanted to use.
The Picture was good but there were a few problems with it. Colour and black levels were both excellent and starting with the THX cinema mode I only needed minor tweeking of the picture settings (I used the Disney WOW HD calibration bluray). Back lighting was not so good I noticed dull edges on both sides of the screen and this was quite noticeable on a few of the scenes of the blu ray (Spooks:greater good) I was watching.
4k and HD unscaled content was smooth and looked very good, SD content was OK at best and not as good as the Sony 55X8509C that I had for comparison, pushing the quality boundaries with some of the lower picture quality Sky music channels edges were very soft and there was a lot of colour bleed with the picture bordering on watchable. A good picture quality Sky channel such as BBC one was perfectly watchable but still looked a bit softer that the Sony.
Sound form the TV speakers was reasonable and clear. But it was this area that I had my biggest problem with the TV and it is why I ultimately had to return it. ARC through HDMI worked fine with my AV receiver as did HDMI control for controlling the volume and bluray player (play/pause and skip etc). Automatic HDMI input switching did not work however. Although the TV would pass Dolby Digital from HD channels on my sky box via ARC to the AV receiver, but when using the TV speakers the TV went silent when viewing a HD sky channel. A 30 minute phone call to Panasonic support (who were helpful) confirmed that although the TV would pass Dolby Digital signals via the HDMI ARC for external soundbars/receivers to decode the TV itself would not decode Dolby Digital audio. For me this was a deal breaker as I don't want to have to go into the settings on the Sky box and change them each time I want to listen to a HD channel on my TV!
The fire fox OS was good and felt responsive, but opening with the home screen each time the TV was turned on instead of switching to the video source was just plain annoying! Hopefully this or HDMI control for automatically switching the TV inputs will be addressed with future firmware updates.
Overall if you don't need a TV that can play sound from Dolby Digital Sky+HD box and watch minimal SD content I would seriously consider this TV, the picture is very good (with the minor exception of dull edges which will only be noticeable in some scenes).
Panasonic TX-55CX802B User Review
Great picture*, reasonable sound, but it had to go back.Review of Panasonic TX-55CX802B tv by timn, Oct 8, 2015.This item was purchased for £1679 from Richer Sounds in 2015.
Contrast/Dynamic Range/Black Level9
2D Picture Quality8
Picture Quality Out-Of-The-Box7
Picture Quality Calibrated9
Ease Of Use9
Value for Money9