Okay, you have a lot of questions there, and I don't grudge you that. You're gonna have to live with your choice a while.
First, here's where I'm coming from: long-time serious video hobbyist who's only incidentally interested in display tech. I began with VHS captures for myself. Soon I had pro level decks, TBCs (time base correctors), and had learned Avisynth for cleaning up /filtering /manipulating digital video. Lossless codecs and lots of hard drive space. It grew into almost a side job, but most folks who want to save their VHS home movies have done so by now. I'm still in the hobby though.
I have to chuckle when guys talk about accurate displays. If they only knew all the trickery involved in video, and how subjective it can be. Especially restoration, though it applies in post production as well. Anyway, there is *NO* perfect display. Lots of hobbyists still use top end CRTs, some pros too. So did I until mine died. What did I replace it with? A top-end Viewsonic LCD monitor. Go to videohelp.com and ask why if you're interested. Mind you, I'm referring to actual editing/cleanup work on the computer, and not to regular viewing.
Plasma vs LED/LCD? They both have their strengths and weaknesses. For the plasma purists who carp about edge-lit backlighting, I say: IR (image retention) and how about it? Even the new ones will get IR if there's a channel logo showing for any length of time. Burn in, not so much nowadays.
Okay, here we go:
1) Judder. usually this refers to the conversion necessary to display 24 fps (frames per second) video on a 60 Hz display. Look up "pulldown judder". Not a problem with any of the sets you're interested in, so don't worry. Then there's the jerkiness you'll see on a slow pan with film material. That's a limitation of the frame rate, and only motion interpolation (creation of intermediate frames) can help that.
You have to understand how digital video is compressed. You have an "I" frame or reference frame with all the frame's information. Like a bitmap. The I frame begins a GOP (group of pictures) in which a P frame references the frame before it and only specifies differences, mainly in motion vectors. B frames can reference frames before and after. All this means the video can be stored in much less space.
So how does motion interpolation work? It uses motion vectors, very much as explained above. Or call it the "average" of two frames, the newly created frame being inserted between the two. That's why higher Hz rating matters, as it affects the possible frame rate, making interpolation possible. I won't even get into interlaced video.
Which leads to:
3) Soap Opera Effect. The result of interpolation or smoothing. Some film purists don't like it, I do. If it's good that is. It's the best you can do with the low frame rates we have now. When I see a slow pan I want it to be smooth. Decide for yourself.
(Notice I skipped #2. I don't think it's much of an issue, but maybe someone else will tackle that one. Though for some material, motion interpolation can introduce occasional ghosting).
4) Lag. Again, I don't game, but if you turn off all unnecessary processing with game mode, it shouldn't be a problem. Look up the response times or search the relevant owner's threads as suggested.
5) Smartphone video. I just dunno, don't have one, but I'd bet the LG can display it.
6) Cloudiness. Not sure if you mean uneven backlighting/flashlighting or something else. Something else would qualify as a defect. Anyway, I addressed the former as pertains to the LG.
7) Active vs passive. I've read some reviews that said the Sony active glasses were hands-down the worst active glasses. Others are available that are supposedly better. Or maybe you're one of the not insignificant minority who just gets headaches with active 3D. No guarantee that you won't with passive as well, but I'd bet not.
8) Noise. Sometimes it's inherent in the source material, sometimes it's the image processing in the set. I'll leave it to others to elaborate as it pertains to displays.
Which leads to:
9) Artifacts. Sometimes it's compression artifacts inherent in the video, usually from over-compression. Like with cable HD. MPEG2 will exhibit macroblocking, AVC will exhibit posterization and banding. Then there are display artifacts, often from over-sharpening or overly-aggressive noise reduction. In the latter cases, you have some measure of control in the TV's settings. Others can elaborate further.
10) Motion blur. I would hope not also.
Or at least nothing that isn't inherent in the video.
11) Jaggy text shouldn't be a problem unless you're overly sensitive or there's a defect.
12) Jerkiness again? Already covered. But again, much will depend on your subjective perception.
I thought you were gonna get your TV today?
[EDIT] Ha, XB beat me to it! I can't type fast enough, or maybe I should cut out the long-winded answers.Edited by fritzi93 - 12/1/12 at 3:46pm