Not having ever shot the SP101 how does it compare to the S&W for trigger and accuracy.

I have seen great reviews for the sp101 but in most cases it's along the lines of "for a ruger"

It's not really comparable to say a S&W 617 by most folks accounts. If in fact it is I would certainly look at them. I've just been led to believe they are not in the same league.

Is the SP101 comparable in frame to the J or the K?

www.huntingadventures.net
Are you living your life, or just paying bills until you die?
When you hit the pearly gates I want to be there just to see the massive pile of dead 5hit at your feet. ( John Peyton)