The highest contrast ratio of the Wortmann AG 3031200 is 30000000:1. That's 50% more contrast ratio than the most frequently found dynamic contrast ratio of 20000000:1. Across all comparable spec PC monitors that have been on the market for more than two years the contrast ratio ranges from Mega Contrast (worst) to 100000000:1 (best).
It may also be worth also looking at one of the other PC displays that have a 30000000:1 dynamic contrast ratio currently available including the L27000WHS-9E, or the LED236W3 (£330.69) both from V7 or the Viewsonic VX2453 (£161.87) which is cheaper.
If the contrast ratio of this medium monitor is not high enough for you then you might also want to look at the Asus ML249 (£185.66) (50000000:1 and cheaper) or the D2769 (50000000:1 and higher rated), or the i2769 (£167.84) (50000000:1 and higher rated) both from AOC.