they don't specifically review the 50" 700u.
Here are CNET's suggested settings for the TH-42PZ700u:
And for the TH-58PZ700u:
Perhaps even more useful is this AVS forum thread where lots of people send in their settings for the 700u series:
I have a 50" Panasonic PZ700U and people keep telling me that CNET has calibration settings for this TV that I can try, but I can't find them anywhere. Does anyone know what the settings are from CNET for my TV?