The highest contrast ratio of the LG 34UC87 is 1000000:1. That's 80% less contrast ratio than the most common dynamic contrast ratio of 5000000:1. PC displays of a comparable spec and age to the 34UC87 dynamic contrast ratios range from Mega Contrast to 100000000:1.
We think you might also be interested in some of the other PC displays that have a 1000000:1 dynamic contrast ratio currently available including because of it's better review score, the LG 34UC97 ($799.99).
If you are looking for a PC monitor with a higher contrast ratio then you might want to look at the HP Z30i (5000000:1 and cheaper); or the 34UC97C ($1,155.99) (5000000:1 and higher rated), or the 31MU97 (5000000:1 and higher rated) both from LG.