Before buying 3D 4K TV, here are some files which could be useful for testing ghosting and resolution of 3D 4K.
Here are the files I've used for testing ghosting and resolution of 4K 3D TVs (I tested only LGs - both LCD and OLED).
The particular model of TV does not guarantee anything. You can get good and bad ghosting on the same model. Eventually, I had to buy the already opened 4K 3D TV "on display" even though the seller opened 2 originally packed TVs in front of me (they had terrible ghosting). Out of about 12 4K 3D TVs only 3 of them were more or less OK concerning ghosting (1 OLED and 2 LED TVs).
So, the video and picture files I've used for the test are here:
Download zip file with right-click and choosing "Save link as". Put the files on some USB 3.0 key which will be inserted into the test TV.
The video and picture files are mostly over-under (except mpo files, of course). The ultimate ghosting test is
On the left eye you should see only red (green) colour, while on the right eye there should be cyan (magenta) colour. The colour should be even without any changes in brightness or colour (try to find the most optimal vertical viewing position, first). If there are any changes in brightness or colour, the polarisation film is probably not ideally mounted and you cannot do anything about it.
The ghosting can also be checked with
but it's only an additional test to the previous one (which is the ultimate to me).
You should practically not see any "ghosts" when checking the picture.
Resolution of 3D on 4K TVs can be checked by:
Due to the firmware bug on LG TVs, the MPO files will be shown in HD resolution per eye (I am not sure whether 1920x540 or 1920x1080) instead of 3840x1080 per eye (like JPG and mp4 variants). This is quite unfortunate, since MPO is automatically recognised as 3D, while for the other files, you should always manually select 3D over-under (moreover, sometimes you have to first switch off 3D and then switch on 3D over-under to see it, since the TV can automatically show 2D to 3D conversion instead!).
Anyhow, my conclusion is that it's very hard to find good 4K 3D LG passive TV. Without the mentioned files (I made them by myself) I would be unable to find good 3D 4K TV.
p.s. By the way, I also tried few 4K LG TVs which displayed 3D in 1920x540 resolution per eye. They were all perfect considering ghosting, but, the resolution was too low for me. The warning sign is the following: if the TV, besides side-by-side or over-under configuration, offers some other 3D configuration like checkerboard or similar, it's probably lower-resolution in 3D mode.
p.s.2. It's also quite unfortunate that on my new LG 4K passive 3D, all the movements in 3D are not "clear". I have exactly the same feeling as on my Panasonic active 3D. Like some kind of temporal missynch. I'll have to test it once with some higher frame-rate camera and analyse the results.