Lovely shots everyone! It is always interesting to see how spoiled we M users are with wide angle lenses. Rangefinders really are just so much better on this front -- the lack of distortion, while still keeping sharpness and a nice look. They just tend to have more character than most SLR wide angles I have seen (and I am even including Leica R in that...I think my Zeiss 18mm and 25mm are much nicer than the Leica 19mm I have for the R).
Here is one with Zeiss 25mm...not really architecture, but it keeps lines straight!