Hi Xavier et al, I second Brian's opinion. We have used a 49" 4k TV, a Sony Bravia X8500B for more than a year now with good results. http://www.sony.jp/bravia/products/KD-49X8500B/ There is probably an updated model of this around.
Passive stereo 3D on this screen has better depth perception than the active stereo on the Asus VG278, although getting the parallax right is tricky. As Brian mentioned, the vertical position of the viewer is critical and there is a rather narrow sweet spot vertically, which might limit its use for a larger viewing room. It gives good stereo perception at a distance - sitting close to it can cause some eye strain in stereo if settings are not tweaked, but it is just a big screen! Despite the 4k resolution, the horizontal alternately polarized lines are still visible in stereo (resulting in half the vertical resolution), which is not a big deal, in particular from a distance. The nice thing is that there is absolutely no flicker or ghosting, since it does not use page-flipped stereo. But for modeling I still prefer the active stereo displays. In 2D mode it works great as a 4k monitor and text appears crisp - the exception is red, which appears blurry and at low resolution (in particular on blue background - this must be due to the dye matrix). It is a great monitor replacement with a lot of screen real estate and I would recommend it as such. It also comes with an integrated camera. It is connected via HDMI 2.0 or display port and I have tested it with both, using NVidia quadro K5000 and GTX980 - the surprise was that windowed stereo worked just fine with the (non-quadro) GTX card (this was on windows server 2012R2, I didn't try it on linux). I tested wincoot, pymol, chimera and Amira in stereo, which all worked. Matt