Have you tried comparing the quality with auto motion disabled? You may want to check the blu-ray player's settings and try disabling BD wise.
I'm using a 2 year old Samsung bluray player on my UN50EH5300, I've tweaked dynamic settings to my liking, and turned on LED motion plus... I have read turning down sharpness to say around 20-22 helps. Still noticing about of dark flickering in some scenes with motion, specifically when the camera pans from left to right in a quick manner. Does sharpness need to be turned down more?