With the competition in the 4K space, the price of the Sony 55K9004A 55" has dropped from UA$5K down to $4K.
This model will be getting a firmware update to HDMI 2.0 at the end of this year.
The significance of this model is that it is by far the cheapest of the name brands, has PASSIVE 3D (their other 55" 4K model is active) with 4 pair of glasses (+2 x dual view for gamers) and several Bluerays optimised for upscaling.
The downside is that it has inbuilt speakers at the side, which makes the TV extra wide, but otherwise, it has a beautiful screen, especially up close.