I use the polarizing filter with the Carry Speed MagFilter Carry Speed MagFilter filter adapter on 52mm magnetic filter adapter for Sony RX100 / HX10 / HX20 / HX30V on my Sony RX100 and I am very satisfied. The filter can be 1A use and the picture quality is perfect. No streaks or distortion. Had only a little concern that the high edge in combination with the MagFilterSystem could lead to vignetting, but this was unfounded.
I use the filter on my 35mm and 50mm Nikkor lenses on my Nikon D300 and I'm here from the usual B + W quality (still have a 72mm Slim Polarizer) convinced.