Leica M Wide Angles
The Leica 24mm f/3.8 Elmar-M ASPH offers pin-sharp results wide open with distortion about as low as found in any 24/25mm lens.
The 28mm f/2 Summicron-M ASPH affords a bit more moderate wide angle effect and with the added bonus of f/2 which can be used to separate the subject from foreground and background, which along with vignetting draws the eye in.