Hi people. I looking for a 10mm and am considering the 20 vs the 20sf. I'm inclined to go with the 20sf just because my hands are mediumish. I have handled both and they seem very similar to me. I'm looking for a pre-owned one, just to keep costs down a bit, and there are more 20's than 20sf's on the market. Do any of you find a major difference between the two as far as handling, shooting ect??? Thanks for any input.