I use an M3 with both 28mm and 35mm, using voigtländer viewfinders. That way I get angle-of-view, for which you almost don't need framelines, and the weighting between foreground and background objects, which frame lines don't show (and which I can't yet visualize after so many years with an SLR).
What I do need is an excuse for an ALC MP that won't come with divorce papers.
PS - You can also try the leica users forum. Those folks would run with a topic like this.