I am an amateur and I recently got XT1 with 14 mm and 35 mm lenses for landscapes and street. I also wanted a lens which would give me better and closer view while being less noticeable on the streets. I am considering 50-140 vs 90mm. I understand they both are big and therefore i will not get away unnoticed but 90mm seems to be half the size of 50-140. At the same time the 50-140 gives you a larger focus allowing you to be further away from the objects of interest. I read a lot of comparison reviews but i am still not sure. What do you think? May be I wrong and both lenses are just for portraits and not for real life?