Ok so lucky me, my dad won a posh raffle and came away with this TV, too big for his living room so i sold my bedroom TV (Sony 55X8005C) and gave him the cash, my Living room TV was a 55JU7000 but this has replaced it.
The build quality is very good, very solid, choice of stand orientation although i couldnt get then in any central position they just wouldn't go in, slid straight into the end slots though.
The screen is pretty reflective as its glass, the TV does get very bright so this mitigates some of the reflections and they arent really an issue in the dark and it has a very nice and thin brushed aluminium bezel, which makes it look quite high end.
I have a minor amount of DSE but its not an issue, it does have brighter edges which can be quite noticeable but it isnt that bad and is source dependent.
The Firefox OS is very easy to use and is very quick and responsive, much more so i feel than Android and maybe just slightly faster than Samsungs Tizen.
The sound is more than acceptable for regular TV viewing, however if you want a loud movie experience there isn't much base so obviously invest in a soundbar or even better a proper 5.1/7.1 or Atmos setup.
Ok so onto the pictures, some of them aren't very sharp as i feel there is more blur on this TV than any other i've owned, so it is hard even pausing to capture sharp pictures, some are also to show the colours the TV is capable of producing and how well it can deal with blacks to whites, in certain situations.
I've have found it a little difficult to find decent settings, switching beteen modes and tweaking as some are a little dull, i havent found the local dimming to be problematic, since wednesday last week i've only seen it dim and then brighten considerably and then dim considerably twice and it wasnt even bad, the Mrs didnt notice.
We are only 8ft away so the limited viewing angle isnt a problem as it was for my friend who returned one of these as he was further away so suffered with washout.
UFC 1080p source.
UFC 1080p Source.
LG HDR Chess Demo
4K Mad Max showing great colour range.
4K Star Trek Into Darkness
Happy Valley 1080p Bluray
4K Amazon HDR The Man in the High Castle
Lucy, Netflix 1080p
The Martian 4K, as you can see much much brighter sides.
Philips lightwave demo
Lady Gaga 1080p Youtube, i use this as it flashes blacks and whites quickly and the dimming had no issues.
This is however much softer than on my other 2 4K capable TVs.
Anyway its a better TV with the HDR than my JU7000, so its replaced that, but this TV is very dependent on the source to give a good image, Blurays look good, decent 720p sources can look good, i've found a lot of 4K Blurays to have more grain than either my X8005 or JU7000, detail is probably a bit better, but built in freeview HD or freesat HD is pretty poor, Mrs wasnt impressed with Great British Bakeoff, it looked bad.
Having setup a DX700 for a friend i wouldnt say this is any better unless you want 3D, this is 120hz vs 60hz on the 700, but there is a lot of blur so it makes no difference, its not easy to sort the colours out so the HCX processor has no advantage and the dimming is the same anyway.
As you can see on some off the pictures the HDR profiles hitting 500 - 600 nits brightens either side of the screen quite a lot on some material so it being brighter than the 700 doesn't matter.
Overall its a decent TV if you can get it for a good price, i don't think i would've spent £1000 on this, i wouldve kept my JU7000 for another year.
Panasonic TX-50DX750B User Review
58DX750b ReviewReview of Panasonic TX-50DX750B LED LCD TV by MikeTVMikeTV, Sep 19, 2016.
Contrast/Dynamic Range/Black Level8
2D Picture Quality7
Picture Quality Out-Of-The-Box7
Picture Quality Calibrated8
Ease Of Use9
Value for Money7