I'm typing this on my phone and so will add more detail to the post when on my tablet, but here are my impressions of OLED and QLED from CES 2017.
First OLED. 2017 is a consolidation year for LG OLED. Showroom picture quality is what we have come to expect in 2016. No breakthroughs. Nothing really 'new' other than the new Wallpaper hanging design. That and consolidation of HDR with demos and support for all
current HDR formats including Dolby Vision, Technicolor, HyperLogGamma, and HDR10 (static).
Some incremental increase in peak brightness for HDR and reduction of ABL but impossible to assess the impact of that on the showroom floor.
Unknown whether they have made any improvements to bear-black uniformity, near-black controls, or CMS controls (buggy in 2016).
LG did make strides in Audio, adding full support for Dolby Atmos to the 2017 OLEDs including full Dolby Atmos 5.1.2 decoding directly into the TVs for use with a Dolby Atmos Soundbar (a first) as well as Atmos-over-ARC like Vizio offered in 2016.
Stripped away 3D, stripped away curved screen offerings, focused on a silver bezel for the B7 (which may be exclusive to Costco) and an anodized black aluminum bezel for the C Series which matches the look of the W Series.
To recap, little in the way of true innovation other than the flashy flagship hanging-piece-of-black-glass W Series and realization of the full Dolby vision: Dolby Vision UHD Player and Dolby Atmos 5.1.2 Soundbar.
Samsung, by way of contrast, had a 2017 full of innovation in display technology..
Their 'QLED' technology appears to truly be a new breed of LCD, largely offering IPS-like viewing angles with VA-like contrast ratio and black levels.
However it is working, the new pixel is visibly different from both IPS and VA pixels, evincing a plasma-like shimmering / DSE when viewed from up close. In near-black, this shimmering becomes pronounced and is visible from 1-1.5 screen widths if viewing distance.
Brightness is great, colors are great, and Samsung is making a great deal of noise about color volume (100% DCI-P3 @ 1500 cd/m2).
So to recap, on the plus side, viewing angles have pretty much caught up with OLED (and possibly even inched into the lead when off-angle color shift of OLED is considered
); and bright HDR looks fantastic.
In the negative side, I have seen evidence of three PQ attributes that may prove to be less-than-promised:
-Blacks do not seem to be close to OLED level. There may be some nonlinearity resulting in reduced blacks at the expense of some black crush, but blacks are still 'glowing' in OLED parlance.
-there appears to be increased banding near-black in dark colors (brown). This could be due to the nonlinearity that may have been introduced.
-the near-black sparkling/shimmering is very visible from relatively close (1-1.5 screen widths) and may mean viewing distance needs to be maintained farther back than that.
For those who value perfect blacks and view in the dark, I believe OLED will retain it's crown for at least another year. For those who watch with some lights on or value brights over blacks, Samsung will retain it's crown as well and will have added to it's lead.
P.S. One more thing I should comment on is that Samsung was far more defensive at the show than LG. LG would allow me to get as close to any screen as Ivwanted and would let me stay for as long ascIvwanted. Samsung had lines on the carpet ad out a screen-widths away and would not let you inspect the screen closely (at least any screen showing any dark portion of content). If you approached a screen closer than they wanted they would shoo you away. They allowed close inspection of the off-angle demo but it was only showing bright content. This may end up being a problem for them on the show-room floor...