The highest contrast ratio of the PA248QJ is 80000000:1. That's over four times the contrast ratio of a 20000000:1 flatpanel monitor, which is the most frequently found contrast ratio. Across all similar spec LCD screens that were released around the same time as the PA248QJ the best contrast ratio is 100000000:1 and the worst is Mega Contrast.
We compared all the other PC screens that have an 80000000:1 dynamic contrast ratio to this flatpanel monitor and we think the u3477 (£499.98), and the Q2770 (£320.11) both from AOC or the Asus PB278Q (£378.30) which has a better Rating is also worth considering.
If the contrast ratio of this medium monitor is not high enough for you then you might also want to look at the Acer 276HUL (100000000:1) which is also cheaper.