The highest contrast ratio of the KA220HQ is 100000000:1. That's over twenty times the contrast ratio of the most common dynamic contrast ratio of 5000000:1.
This PC screen's contrast ratio (100000000:1) is in fact the best contrast ratio amongst all medium monitors that came out more than a year ago.
Amongst similar types of PC screen the worst contrast ratio is Mega Contrast.
It may also be worth considering one of the alternative LCD screens that have a 100000000:1 dynamic contrast ratio currently available including the Acer K222HQL which has a better Rating.