The DELL P2714H has a maximum contrast ratio of 2000000:1. That's 60% less contrast ratio than the most frequently found dynamic contrast ratio of 5000000:1. The contrast ratio of all flatpanel monitors of this age and type ranges from Mega Contrast (worst) to 100000000:1 (best).
It may also be worth also looking at one of the alternative PC screens that have a 2000000:1 dynamic contrast ratio currently available including the U2515H ($327.98), or the P2415Q ($329.44) both from DELL which has a better Rating.
If you would prefer a PC screen with a higher contrast ratio then you might also want to look at the 29UB55 ($205.99) (5000000:1), or the 27MP77 ($394.99) (5000000:1) both from LG or the Lenovo Pro2820 ($484.49) (3000000:1) which is also higher rated.