I found the Panasonic default for sharpness to be very accurate on my GZ950B. However, you really need a sharpness test pattern, and you should adjust your sharpness control until the image is sharp, but no halo effect is introduced.Sorry I don't quite follow your first statement. 30 is the way to go but pro calibrators would set it to zero?
Just trying to figure out if 30 is actually 0/a base with no processing, or if it is indeed adding sharpness to the source.
I use the test pattern from the Spears & Munsil UHD Benchmark disc.
I think for many people on AVForums it’s become the norm to turn sharpness down to 0, because older TV models used to be over sharp by default - but that’s not necessarily the case now. So you cannot assume 0 sharpness is correct.