4K-X is a massive upgrade from the 5442. I recently bought a Hikvision 2cd-2387lsu/sl (8MP, ca. 180USD on Aliexpress ) [or 2cd-2347lsu/sl (4MP ca. 130USD on Ali) which is similar]. The Hik is a bit better because the built-in white led can be automatically enabled/disabled and the noise reduction/video compression is much better than the choppy stuff on the 4k-X I own.
Rule of thumb: if you're outside at night and you can see your surrounding relatively well, the color camera will produce a decent color image of that scene. If you practically see nothing, the cam won't either. You still can turn on the led, even LED set to 5% will produce a good color image.
I have little ambient light, so I chose a slow shutter to catch motion and then let the Hik turn on the LED. The shutter then runs faster, the image has no ghosting and I practically added a motion activated light to my home with this cam. One important tip is to reduce the contrast to 35, it will produce a bright and clear image.