As also being discussed in another thread here, there is hardly any content available right now and most probably in the near future (atleast for few yrs) that would justify the substantial cost premium presently being commanded for such (overly) hyped UHD TVs.
The only tangible benefit of such hi-res TV right now might be for using with a PC but even then, one would need a suitable high end m/c with high end graphics card that can make good use of the screen real estate - even here there is a bottleneck of software presently not being able to scale properly..
So unless there is a specific need for going for a UHD, it definitely does not make sense to waste the money presently on these UHD TVs for our regular SD/Bluray contents available - for this 1080p is good enough. By the time the UHD content is widely prevalent, the current hardware would be obsolete with god knows what new tech in upscaling, audio, connectivity options and tv s/w interfaces..
If the only criteria is BIG display then maybe a projector is a better alternative to try out.