Thanks man! Glad to see some familiar names around here still!

Yeah, 65" go big or go home right? Haha.. well I sit about 7-8' away (maybe a tad more), so per your handy chart there,
looks like I'm just within the "Ultra HD Worth It" range. I can say this - I do notice a difference when feeding it actual 4K content. Even the upscaled 1080p stuff looks better, but that could be entirely placebo effect.
On the downside - and this isn't the thread to discuss displays obviously, I will truly miss the richness of color and the deep blacks that old Panny plasma can produce. Granted it's still in use in the bedroom but I don't do my serious movie watching there. Not sure where I stand on the Samsung's edge-lit backlighting either, it's just weird.. and the viewing angle sucks compared to the Panny. But seated in the main viewing position she's a beauty in her own right. It's too bad Panasonic left the game and let Samsung take over the market.