as a owner of that exact set for almost a year, I would!!
I don't know if Dnice is a professional or not I've never seen his ISF Certificates and don't know if he has any at all not to say be doesnt but I'm basing my Commit off of a Professional who does have His Level l &
Level ll ISF Calibration certificates and has been doing Calibrations for, four+ years on projectors, Plasmas, LCD's & LED's TV's.
He specifically said, "on Plasmas they need a higher sharpness setting"
So making the commit "sharpness needs to be 50" on panasonic Plasmas is based off someone who did my tv who actually has multi thousand dollar equipment including SENCORE VP403 calibration Tools.
Not sure what equipment used in the making of this thread but if it was anything less then SENCORE then he probably doesn't have ISF training. SENCORE is the industry standard.