Ah yes I should have known. My first 900a had a small cluster of dead pixels and a yellow tint in the middle. Returned it and got another only to find still a yellow middle (although better) but much worse horizontal LED banding. Told myself after that I wouldn't buy another top tier TV. I'd rather be dissatisfied at half the price. :-)
Yeah, not much sense in having a 4k TV if your cables can't handle the signal.
Actually a decent Samsung ,LG or Sony 4K HDR or SDR TV upscaling 480i/480p /720p/59.94 and 1080i/1080p content looks better with more color volume and saturation within the color volume below clipping and sharper than a native 1080p panel with the same content vis a vis good upscaling now and 4 X 1080p pixels and chroma pixels and less LCD blooming with the smaller pixels and so on.
There is no reason to buy 1080p anymore outside of a constrained budget , the new ones are low spend rubbish anyway not like the older good 1080p TV's up through maybe 2013 -2014 or so mostly at Samsung because that was Sony's cash starved design rubbish TV product crisis noting I have been buying Sony Trinitron and Sony XBR TV's since 1993 and the 2013-2014 product wasn't up to what I would expect of Sony Bravia or Sony XBR and Samsung beat them to real HDR -10 TV's .
2013 -2014 cash starved production Sonys were mostly rubbish IMO and some were carry over models ,a lot of them also had panel defects above that with the rubbish AUO panels and LCD cells they were using then before the Sony TV subsidiary restructuring out of Sony inc. into an owned Sony Inc. subsidiary and its own better management and autonomy .
My 40" 2013 Sony Bravia LED/LCD was rubbish
with poorly saturated red and green color primaries ,color banding and color/worse than what they normally are on all the conventional SDR /HD Blue LED lamp panels
outside of a real 10 bit Wide color gamut HDR TV ,CCFL /LCD or Plasma .
My 2013 Bravia model had low brightness and color volume all not nearly as good as my 40" real 8 bit + frc decent Samsung panel 2012 Toshiba CCFL/ LCD or the 40" 2012 Insignia here with the same exact CCFL /LCD panel as the Toshiba-Compal .
Old school CCFL /LCD TV panels have better white light spectrum than conventional LED panels with blue -yellow phosphor treated LED without severely pushing blue spectrum before the LCD cell and they make better primaries and color all around within the bt 709 boundaries , besides that they all ripped everybody off charging folks more for cheaper to make LED/LCD TV's as long as they could .
I kicked the 2013 Sony Bravia blue LED rubbish out of this room not a minute too soon for the real decent 2015 Sony 4K XBR in my sig , it's defect free as LCD goes
w/ a decent Samsung VA LCD cell /Sony Triluminos 4K HDR panel.
I had to disassemble the rubbish 6 bit + frc panel in the Bravia and put new LED strips in it from new salvage on E pay because they were dropping failing randomly at 2 yrs after I put it in another room at 1 year here .