Not all Hoya filters are of the same grade. Wanting to squeeze the maximum IQ from my new RX100, I got a CPL and UV Hoya HD to fit the Sony adapter. The current HD2 line costs more, so I went with discounted HDs. They are very thin and well made, but the best feature is that the polarizer transmits more light, allowing a higher shutter speed. They are resistant to fingerprints as well. I think the Minolta filters would give IQ equal to the HD series, but not sure how they compare to cheaper Hoyas.