I ordered and received my 2019 82" Q80 from Samsung.com last week and have been playing around with the settings.
Initially, it had a quirky issue, after taking it out of the box, removing the styrofoam blocks, and unwrapping the protective foam "sack", it had this fine "glaze" on the screen that could only be seen with the TV off and using a flashlight held at an angle (I noticed the glaze while looking for the screen protector -- see below). While the glaze did not seem to effect the picture quality (which was outstanding), it bothered me, and so I called Samsung who said they thought it was probably from the foam "sack", and recommended I wipe the screen with a micro-fiber cloth, which I gently did, and the glaze easily and completely came off almost like it was a fine "dust".
The original packing looked complete as well as new, so I don't -think- I somehow got a used or refurbished unit. There was absolutely positively no screen protector in place, other than the two thin strips on the right and left sides of the screen, and the thin protector around the bezel -- and Samsung confirmed for larger models there probably would not be one for the entire screen (seems bizarre to me). To make sure, I checked the corners with a magnifying glass, and tried the flashlight trick to see if the reflection was white or a rainbow, and it was a rainbow (apparently that's due to the antiglare and/or wide-viewing angle screen capability).
Decoding my serial number "08UW3CAMC00XXX" (XXX are numbers) seems to indicate: made in Mexico in Dec 2019, so a very recent build. The version was "FA01" so a Samsung-made panel from the first run ... which surprised me. Not sure if I should consider myself lucky.
In any event it has a great picture ... except ... I have my current previous TV, a 65" KS8000 set up right next to it, so I can do an A/B comparison -- and while the Q80 is brighter, and has a slightly crisper detail, overall IMO the picture is just not that much better (other than being bigger of course). In fact, I have not been able to adjust the colors quite to my liking, even using Movie/Warm2 there seems to be just a hint of too much green in the flesh tones, where my KS8000 seems more "correct" or perhaps I should say more "to my liking" -- which I don't blame the TV for and may need to have it calibrated. Regardless of source material -- standard or HD resolution, SDR or HDR, there are always a few scenes where the KS8000 actually looks better -- so I'm actually thinking of returning the Q80 and just living with my KS8000 a few more years, and try again a few years down the road. I've only got a 15-day return window, so it's hard to get comfortable with it in that short a time span, especially considering the price commanded by the Q80.
Comments regarding my experience would be very welcome. Thanks.