I've read at credible sources like Vizio owners forums that Vizio updates are often for things that don't work right and product released with known bugs to make marketing deadlines and often the updates don't work either .
I read the CMS is usually broken on a lot of Viszio TV product and it's best not to calibrate those TV's because of that ...................., IMO you can't make a silk purse out of a
Tier two brand product with firmware updates and they don't make TV's at Vizio anyway they are a Vizio OD marketer without an HDR 1000 spec. TV ,I call them
at best slightly above blue light special rubbish noting thats just my opinion and I can repair TV's at the board level .
I always buy
tier one brand sets at Sony ,Samsung and LG .
OTOH Sony TV updated the 2015 Sony 4K WCG HDR products to upgraded full HDR processing ,HDMI 2.0a , HEVC and VP 9 the same Android 6 platform and ultimately the same HDR /SDR processing and also the
backlight control processing as 2016 Sony product
as applicable and some of the 2017 Sony product .
Sony will be making Android 7 ( Andoid N ) a 2015 to 2017 Sony Android platform update and thgey have a new TV android software update channel now for the TV's for new firmware features and so on going back to 2015 product while the apps update automatically .
All that makes a good argument for the usual Sony Tax

.
Sony also firmware upgraded the 2015 Sony XBR 850C here for better HDR /SDR processing and significantly more backlight brightness to match the 2016 same product tier
That said I think the 2016 product
smart money for a
not too spendy real decent TV is the
4K SDR Samsung KU 6290 and virtually the same
Samsung KU 6300 that just adds bluetooth and for
4K wide color Gamut full HDR the
Samsung KS 8000 .