I figure I can take panoramas with the 35mm but trying to visualize a photo I will have to stitch later will be difficult. I will try to find a used Canon 20mm or 24mm before the trip. Thanks for all your input!
I was also speaking with a friend about traveling with a DSLR. He is an avid 5D user but decided to pick up an SL1 for his trip to Korea and Japan. Shortly into his trip he wished he had the 5D as the SL1 was cumbersome to use and he just missed the full frame quality. I told him at that point if you are going to compromise on bringing a full frame DSLR by bringing something inferior, you might as well just not bring anything and use your phone
these days the best smartphones match the image quality of budget-line DSLRs.