hey das,
I am using 50B6000FHD since oct-15 and no doubt the panel is very good.
My MMX tv settings are as below, which do justice to both SD and HD channels from ADTV, even in sports too.
Contrast 55
Brightness 38
color 27
sharpness 40
color temp - user, all RGB 50
Dynamic light off
Eco - high
all other gimmicks off
Just thought, it may be of some use though the settings are individual's preference.