I recently purchased a TC-P60UT50 that I returned for a replacement because it was sold to me, unknowingly, as an open box item. I had the first unit for a few days and I took some measurements. I've also taken measurements on the replacement set. On the original unit I was able to achieve 30ftL in Cinema mode at a Contrast setting of 85 using the ColorHCFR large APL pattern. On the replacement unit, I'm only able to achieve a maximum of 24ftL (Contrast at 100) on the same pattern. I updated the firmware and did a hard reset to no avail. Both sets had around 40 hours of usage during measurements. For comparison's sake, I took measurements with ColorHCFR's small APL window and regular window and I was able to achieve a maximum of 33ftL and 31ftL, respectively.
Is this type of unit-to-unit performance fluctuation normal? I can't imagine so. Has anybody else come across a similarly dim 2012 Panasonic plasma?