The highest contrast ratio of the ProDisplay P221 is 3000000:1. That's 40% less contrast ratio than a 5000000:1 LCD screen, which is the most frequently found contrast ratio. The best contrast ratio of all PC screens that were launched around the same time as the ProDisplay P221 is 100000000:1 and the worst is Mega Contrast.
There are a number of other PC monitors that have a 3000000:1 dynamic contrast ratio currently available which you might want to look at including cheaper flatpanel monitors such as the T2254[pl_2805449_price], or the T2254p[pl_2910668_price] both from Lenovo.
If you would prefer a PC display with a higher contrast ratio then you might also want to look at the 23MP57[pl_2766346_price] (5000000:1 and cheaper), the 22MP67[pl_2766322_price] (5000000:1 and cheaper), or the 23MP47[pl_2767864_price] (5000000:1 and cheaper) all from LG.