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For a general methodology description, look at my lens tests.

Here I'll only talk about the changes made for testing my filters (not the ND filters, those are here).

First, a note: this results are not comparable with any of the previous ones, lots of changes in camera, settings, etc.

I used three lenses: a Leitz Elmarit-R 35mm f/2.8, a Leitz Elmarit-R 135mm f/2.8, and a Carl Zeiss Jena Sonnar 135mm f/4, both using fotodiox adapters (from Leica-R and M42 to EOS). I picked these lenses because one is my main lens, the other are the longest lenses I regularly use.

The filters I have tested are the following:

Fotodiox diffuser filter
Hoya CIR-PL circular polarizer (not the HD version)

please visit my equipment recommendations

Results with the diffuser

What it does (33% crops)
without diffuserwith diffuser

How much sharpness you lose
without diffuserwith diffuser

Results with the polarizer

What it does
without polarizerwith polarizer

How much sharpness you lose (seven shots with different polarizer directions)
without polarizerwith polarizer (brightened)with polarizer (original)

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