Most of the time I keep a Sonnar on my Leica's. I am notorious for being a Sonnar fanatic. Today I took three 50/1.5 Sonnar lenses out to Gunston Hall in Virginia. This is the 1935 uncoated 5cm F1.5 on the M9, converted to Leica mount. Optimized for use wide-open. Anyone else use Sonnars? Any make. i'll post some with the Canon, KMZ, and Nikkor up as well.