ok, i made it simpler: just shoot the same thing with shutter overidden at 1/2000, 1/8000, 1/16000 and 1/30000 of a second. here are the results (IMG_09401, 09411, 09421 and 09431 respectively). i for myself didnt notice much of a difference. and still: one can see that the smaller the exposure, the darker the image gets - which is an indication that less light came in as smaller the time the aperture was opened - which should be proof that the shutter speed overriding really worked (at first picture, taken with 1/2000, the iso was 200, but i dont think that affected much the image - the others were taken with iso 100).
its true that i would have also preferred as proof of effective shutter speed overridding a more clear dividing of water drops in the image.
for some reason the first image is overexposed (i doubt it was because of iso 200) but one still can notice the drops of water.
