I noticed that darker games on my x55 didn’t look good, like dark tones and blacks were almost inverted looking at stock settings. After a bit of tweaking, setting gamma from default (50%) to 67% got everything looking good.

After checking out a few YouTube videos it seems the gamma level on the display varies between units. I’ve seen it look good on default in some and even up to 100% on one video. Play with the setting and dial it in to what looks best for you.

If it helps I’m currently using:

• brightness 68%
• gamma 67%
• contrast 52%
• saturation 60%