Since the Panasonic has very good reviews and was raised in an audio newspaper in the Referenstatus I getetetest him.
Panasonic BDT 500: Focus +, black level +; Color gradations: o, o plasticity => picture seemed a bit flat
Marantz UD 5007: Focus +, black level +; Color gradations: +, plasticity + => Overall very balanced
Yamaha BD A 1040: Focus ++, black level +; Color gradations: +, plasticity + => images so crisp and vibrant colors.
Especially in a direct comparison to the expensive Marantz or the very latest Yamaha (2015) one can see that large differences.
Better Farbabstufen and more plasticity in Marantz and Yamaha, and better sharpness at Yamaha.
Advantage of Panasonic: An incredible variety of connections, which do not exist as in the other.
Further advantages of the Yamaha: passing over Miracast and Bluetooth possible.
The leaderboard of an audio magazine was not understandable for me, there were all three candidates at eye test the highest possible score. Maybe even have time to readjust the test criteria.