The highest contrast ratio of the L27000WHS-9E is 30000000:1. That's 50% more contrast ratio than a 20000000:1 LCD screen, which is the most common contrast ratio. Across all medium monitors that came out more than two years ago the worst contrast ratio is Mega Contrast and the best is 100000000:1.
We compared this PC screen to all the other LCD screens that have a 30000000:1 dynamic contrast ratio and we think the Viewsonic VX2453 (£161.87), and the V7 LED236W3 (£331.52) which is cheaper is also worth considering.
If you would prefer a PC monitor with a higher contrast ratio then you might also want to consider the Viewsonic VG2433 (£127.49) (50000000:1), or the AOC i2769 (£167.84) (50000000:1) which is also higher rated.