Ok so I got my 64" f8500, and partially set it up (used the bottom portion box as the stand and plugged it in).
My initial impressions have left me on the fence regarding whether or not I'll keep this tv. First off, the picture quality is excellent, from the colors down to black level. I have my calibrated kuro elite pro 101fd as a reference directly behind it, and unfortunately, the black levels on the kuro are far superior to the Samsung, but it isn't a deal breaker.
My Samsung also doesn't suffer from intolerable buzzing so I'm happy about that. A few negatives that I've noticed that really bother me include dithering, dirty screen effect, and a faint horizontal band.
1. The dithering... even up close, my kuro produces zero rgb pixel noise in dark gray, shadowy areas. But, the Samsung seems to have rbg pixels 'dancing' around to reproduce areas that are not completely black. I have never seen noise like this before, but from what I read it is normal (ish). and only noticeable from 4-5 feet away. Can anyone else confirm that this is the case on their f8500, or is there something "special" about mine?
2. Dirty Screen Effect (DSE)... I play lots of video games on my kuro, and I was hoping the Samsung could replace it as my main gaming/movie tv. Unfortunately, when I pan around slowly in games with solid sky backgrounds (Zelda windwaker, infamous second son, etc.) I can't help but notice areas of the screen that are not uniform and have a cloudy/splotchy effect which is completely noticeable in everyday situations. My kuro, again, does not suffer from this at all. So i'm a little disappointed with the Samsung here.
3. Horizontal band... from what I read, most of the f8500s seem to have a faint horizontal band just up past the halfway point of the screen. This isn't very noticeable during everyday usage and I could definitely live with it.
4. Input lag... Oh man, it's soooo noticeable. A perfect test is having the wii u plugged in and fire up Mario kart 8. You can HEAR the lag between the gamepad controller and the tv. It's a split second, but it's there. I have lowered it by using game mode, but the picture is brutal. I'm sure I could calibrate a reasonable game mode picture though.
I realize that no panel is perfect, but I am used to a near perfect pro 101fd, which has met my standard for what a $3k+ tv should look like. I'm not sure whether other owners suffer from similar issues (as noted above) but i'm really on the fence here.
If the tv didn't have noticeable DSE, I would keep it without thinking. It's unfortunate that my eyes have been spoiled by the Kuro Elite, but it at least puts things into perspective for what I should expect out of a 3k+ tv.
I would like to hear the opinion of others on the matter noted above, and perhaps that will give me some perspective regarding my choice. There are very few of these TV's in my areas, so I don't think i'll have the option of exchanging, or swapping.