I am headed to Japan in about a week with my 5DmkII. I'm debating on weather or not to rent a 17-40 f/4L or take the 14mm Rokinon f/2.8. I'm looking do some landscape/cityscape shots both during the day and night.
The other gear I am taking is a 24-105 f/4L and a 50mm f/1.4. I have a 70-200 f/2.8L IS that I've decided not to take due to weight and lack of usage.