The Lenovo T2424 has a maximum contrast ratio of 3000000:1. That's 40% less contrast ratio than a 5000000:1 PC display, which is the most frequently found contrast ratio. Medium monitors that have been around for more than a year dynamic contrast ratios range from Mega Contrast (worst) to 100000000:1 (best).
It may also be worth also looking at one of the other flatpanel monitors that have a 3000000:1 dynamic contrast ratio currently available including the HP ProDisplay P221 which is cheaper.
If the contrast ratio of this PC monitor is too low for you then you might also want to consider the iiyama XUB2390HS-B1 (5000000:1 and cheaper).