I have the 55" version of this tv, and only owned for just 7 days now, it is a replacement set for last years 55UB850V which was sadly damaged, so I can now compare between the 2 models.
1st off is the improvement with this years WebOS 2.0 and it's quad core processing, it has definitely improved how the smart operating system works, multiple apps can be running in the background without hampering performance.
The all in one Magic Remote is so much better too, however it does lack any media controls such as play, pause, fast forward, rewind etc.
The freeview tuner side of things has took a step back on the SD channel, where faces look like plasticine, this was improved on the ub850v with firmware updates. I did have an issue with last years model where the image would flicker when changing between 1080i and 1080p resolution, this years model isn't affected.
On the 3D side of things I'm yet to give it a thorough test, but noticed more crosstalk due to limited viewing angles over the ub850v, the menu buttons at the bottom of the screen are double images, but corrected with a better viewing angle, even though this years model sits slightly higher on the stand by around 5 cms you would have thought the view angle would be better.
If anyone is wondering about what footprint you need for the ribbon it is 110 wide, a lot larger than the ub850v's 890 cm, so consider this when choosing a tv stand.
One thing that has my attention at the moment is some image retention now and then, it was brought to my attention when I 1st unboxed and started the tv, then proceeded to update the firmware, the white menu on the left hand side of the screen was open for around 10 minutes whilst it downloaded, and upon restart the menu was still behind the grey WebOS start up splash screen, which was still there after a couple of minutes, something I will be keeping an eye on.
LG 65UF850V User Review
LG 55UF850VReview of LG 65UF850V LED LCD TV by Superflyguy_uk, Jul 26, 2015.This item was purchased for £1,215 from Currys in 2015. The reviewer still owns this product.
Contrast/Dynamic Range/Black Level8
2D Picture Quality7
3D Picture Quality9
Picture Accuracy Out-Of-The-Box8
Picture Accuracy Calibrated9
Ease Of Use10
Value for Money9