Here's a comparison between
DeGrainMedian(limitY=5,limitUV=7,mode=0) and
dfttest(sigma=1.25) on an extremely crappy source:
Source (resized by two on VDub's preview window):
DeGrainMedian(limitY=5,limitUV=7,mode=0):
dfttest(sigma=1.25):
If you want more pics, let me know.