Finally, I got to test the new Schneider Digital+ filters I bought and are very pleased with them. I may be wrong but I found the CPL to give a marginally warmer tone compared to the Marumi DHG and Kenko Pro-1 Digital. As for its thickness, both the Marumi DHG and Schneider Digital+ are the same with the Kenko a little thicker.
As for the MRC-Haze, I didn't compare them to other filters but for those who are interested, comparisons have been made against the B+W MRC Haze. The comments in the link are in Chinese: http://digital.photosharp.com.tw/DIG...No=3240&Lang=0