2)I'm not a big fan of 35mm lenses, to me they are too close to a 50 and so, I
prefer a 28. 21mm is a pretty wide lens if it's the only one you've got and it's
possible to get pretty tired of the distortion all the time.
What distortion, John?
My 21mm lenses (Biogon, Super Angulon and Color Skopar) don't distort.