The highest contrast ratio of the K242HQL is 100000000:1. That's over twenty times the contrast ratio of the most common dynamic contrast ratio of 5000000:1.
A 100000000:1 dynamic contrast ratio is actually the best contrast ratio across all PC screens of this type and age.
The worst contrast ratio amongst similar types of LCD screen is Mega Contrast.
It may also be worth also looking at one of the alternative PC monitors that have a 100000000:1 dynamic contrast ratio currently available including the G247HYL ($114.99), the 42HQL ($107.99), or the K212HQL ($114.00) all from Acer which is cheaper.