I calibrated my 50S1 to about 35ftL on Cinema / Warm. Very bright and color and gray scale tracking is accurate across the range, except at very low end. Panasonic Plasma are a weird beast when it comes to how much light they put out, it seems Cinema is very limited, however Custom and Vivid can put so much light that you can use suntan with it. I tried calibrating the Custom at Warm, but couldn't get the tracking across the range right, and the picture just didn't "seem right". It looked good, but every once in a while a scene or a whole show would look off.
BTW: Sharpness setting has a negligeable effect when using HDMI with HD source, but does have an effect on SD input and all analog input regardless of HD/SD source.