Hey y'all, I'm happy to say I am now a 64F8500 owner! Great set so far, a guy at my local BB I kinda know hit me up when a customer brought it back because they wanted to go the projector route instead. Once I get the hours on it I'm having a calibration done for sure. I have this setup in my man cave in my garage, and I gotta say the brightness on this tv is incredible! I have a Panasonic 60GT50 ( an amazing tv as well ) in my living room and it can't touch the Sammy in brightness. When I first showed my bro in law the F8500 he thought it was an led for a sec, lol.
I do my fair share of gaming when time time permits, and I gotta say the input lag hasn't been an issue at all. From GTA 5, Tekken Tag 2, MK8, and Rayman Legends I haven't had any issue with lag, perhaps I'm just not that sensitive to it, or I just don't play enough of those twitch COD/Halo games to really notice.
Blu-Ray movies are killer! Streaming Netflix, Hulu, and the like from my Chromecast looks great as well. Overall color is great, off viewing angles have been awesome, and of course black levels are amaze balls. The speakers are probably my biggest complaint about this set, they sound pretty hollow, and uninspiring, however I didn't buy this tv for its sound quality, so more of a nitpick than anything else. I have a sound system for that duty anyway =)
If you want to get one of last great plasma's and it's in your price range, I totally recommend jumping on one. Till OLED's come down in price these plasma's are our last bastion of content viewing hope IMO =P.
Video: Samsung PN648500AF, Panasonic TC-P60GT50
Audio: Onkyo TX-NR818 with B&K Reference 200.7, Behringer iNuke 3000DSP for subs
Speakers: Klipsch RF-7 II's, RC-64, RS-62's RSW-15, Dual DIY Stereo Integrity 18" Subwoofers
Misc: Xbox 360, PS3 Slim, Wii U, Apple TV, Chromecast