A while ago I shot the NEX-3 with the Leica 50mm Summicron M on black and white and I came away deeply impressed. See here for my review.
More recently I decided to try out the Fuji X-100 on the same wooden log cabin and was just as impressed. Take a look to see what you think. Bear in mind that the lenses being compared are quite different in all but max aperture - a 50mm interchangable vs a 23mm fixed.