I plan on using the 21mm lens more and more this coming trip. I have fallen in love with the slight distortion and wonky tight compositions you can make with this lens. I am not sure if it will be the Nikon or Leica version but I will shoot lots of portraits with the 21 this trip. I am leaning toward the Leica 21mm combo, I have fallen in love with that lens and the Leica is so much less intrusive (small and quiet versus big and noisy).