I wish I could define it better. Essentially, the image on the C6 has a bit of grain and a yellowish/greyish hue, neither of which I could see on the E6. I think iit was caused predominantly by being able to see the ABL kicking in. Of course, that was comparing retail displays which is never the best comparison anyway. I will try to get a shot tonight that shows it up.
I tried Tomb Raider and The Last Of Us this morning, and one thing that struck me was how I had to turn the brightness way up on the in-game menus to be able to see anything in the dark, which I'd previously cranked way down on my old TV. Two very different panels.
Thanks everyone. I'm hooking up my Samsung UE55HU8500 one more time tonight to get a good comparison again, and then I'll decid for sure. If I do go Samsung it'll be odd, though, as I've had an OLED phone for years, love it, and have always wanted an OLED tv. I just don't think I'm really feeling *this* particular model. Maybe in 2-3 years...
There is no way you are ever going to get your eyes to adjust to the new display if you keep running them side-by-side. That's a bad idea. I have 2 different tablets and if I view them alone they both look great. If I view them together, they both look terrible, as one looks yellow and one looks blue when I see whites. They are just different color temperatures, but they bias my eyes and neither looks good.
Your settings are far from reference so it's tough to assist you. It's also difficult to make judgments using photos of a screen, which we then view on our LCD monitors. That being said, the Batman pic you posted looks far from flat or dull as you mentioned.