We just did a comparison of the Samsung J6300 50", 55" and 60" panels to see their differences and the results are interesting. You can see the full comparison here. There is a few corrections to be made in the Amazon post you refer to. First, the 60" J6300 version MS01 is a Sharp panel as seen in the service menu of the TV. And both this panel and the 50" (version DH02 by AUO Optronics) that we have tested had better contrast than the Samsung 55" panel (version TH01). Blacks were the same for the Samsung and Sharp panels but the 50" AUO Optronics got slightly better/deeper blacks. As far as motion, both the Sharp and AUO Optronics had faster response time (less blur) than the Samsung panel. The Samsung panel also got beaten when it came to input lag. That said, the differences between the three panels weren't big and at a level where it is nearly impossible to differentiate just by looking at the TVs. In the end, from the tests we have done, the panel lottery isn't something to worry about.