Just grabbed an R100 for my Chicago trip next month! My logic was getting the 50mm 1.8 since it's so cheap but then I read the crop factor makes it way too tight for street stuff. I saw the 28mm pancake too but is it too slow for night shots? Budget is $300 max... which one actually works better?
Honestly, be careful with that 50mm in a dense city like Chicago. I once tried shooting alleys in Philly with one and basically spent the whole time backing into traffic just to fit a sign in the frame... nightmare.
Jumping in here cause I love nerding out on these specs! You are totally right about that 1.6x crop factor on the R100... it changes everything. Here is how those focal lengths actually behave for your Chicago trip: