The Hanns.G HX194 has a maximum contrast ratio of 80000000:1. That's over four times the contrast ratio of a 20000000:1 PC monitor, which is the most common contrast ratio. Across all LCD screens of this age and type the contrast ratio ranges from Mega Contrast (worst) to 100000000:1 (best).
There are a number of other PC screens that have an 80000000:1 dynamic contrast ratio currently available which you might want to look at including the VK207 (£124.99), or the VS207 (£79.32) both from Asus which has a better Rating; or the Hannspree HP205DJB (£77.95) which is cheaper.
If you are looking for a PC monitor with a higher contrast ratio then you might also want to look at the 196L (£97.62) (100000000:1), or the 176L (£89.42) (100000000:1) both from Acer which also has a higher Rating.