Have you tried a Bessa RF with a Voightlander 12 or 15mm lens? If you haven't, you don't know what you are missing. Pretty much any of the makers have good wides but barrel distortion will tend to be the least of your worries if your not used to wides. A good 20 or 24mm lens will set you back a few bucks but most first time users tend to think in terms of standard or zoom lenses and so the subjects get swallowed up in the scene.