My L has never jammed. Ok, that's a lie ... The one time it jammed was when I was loading and re-loading the same roll of film over and over and as I prepped the film advance to get the sprockets in place, my finger grazed the curtain. The thing jammed. I think what I did to fix it was take the lens off and delicately fiddle with the curtain hinge until slipped back into whatever position it was supposed to be in. Other than that, I've been very careful about rewinding, loading, etc and never had a jam. Then again, I'm absurdly careful with equipment to the point of probably needing a session with a shrink every couple of months or so.
Moral, don't be like me. Life is full of jams.
I have the 25mm lens as well and can show you some work I've done with it, mostly with Tri X 400