schwatzz :
See if you can find a 4k calibration disc or hire a professional to come calibrate your TV.
Forgot about that. It is true that many HDTV's have poor factory settings for color.
I've never used this, and there are other links:
http/www.techhive.com/article/2079503/easily-calibrate-your-new-hdtv.html
There are OTHER settings aside from basic color calibration as well.
There are two "issues" to consider:
1) is it the COLOR that is the problem, or
2) is it the SHARPNESS, or amount of DETAIL that's not seemingly improved.
Color might be improved through calibration, but if nothing seems off but simply not much better than BluRay that's likely due to the viewing distance.
Also, even if it's "4K" that doesn't mean the content is necessarily a lot better than BluRay either. Netflix streaming "4K" is about the same, or just slightly lower than BluRay quality as it's 4K but compressed (so uh, what's the point? oh right, you can call it 4K).
DEADPOOL is new so should look visibly better when viewed from about FIVE FEET on your HDTV (55") compared to the BluRay version.