Quote from the review at Trusted Reviews:
“It’s hard to describe how different an X-Black display looks from a standard TFT. I guess the big difference between an LCD screen and a CRT screen is that an LCD is transmissive while a CRT is emissive – this allows the CRT to be much brighter and produce richer and more vibrant colours than an LCD. The best way that I can describe an X-Black screen is that the image it produces is closer to a CRT than a traditional LCD screen.
The downside of the X-Black coating is that it makes the screen more reflective than a standard TFT, which can cause problems in areas of multi-directional ambient light. That said, I’ve used Sony notebooks with X-Black screens in many environments and have not found the increased reflectivity too much of a problem. For me at least, the brightness and vibrancy of the image far outweigh this issue.”