Thank you for the examples. The cathedral shot is exceptional. Talk me through your affinity for the 16 with IS considering I will have a tripod and remote shutter release? I am leaning towards the 2.8 III. Does IS really make it that much? Cost isn't really a factor since I consider this a lifetime investment. How much do I need to worry about depth of field on the 2.8 for architecture at night? Also, want to avoid the grain that high iSO brings. So many questions. If you could choose any lens for this application, which would it be?