What really matters is getting out on the street to make photographs. The gear you carry isn't as important as challenging yourself to shoot. I sometimes take a Zero Image 35 mm pinhole camera to make street pictures, and other times I use a Crown Graphic 4x5. It doesn't matter what gear you use in the end. Worrying about this or that camera or lens is an excuse to procrastinate from shooting. I say get the Xpan and use your Leicas are the same time. Just do it.