I recently took my X-T1 and 18-55 to the DRC for a few weeks. Humidity around 90% every day, very hot, and the Fuji stood the test. My D800 would've begun falling apart I'm sure. I didn't feel I needed any other lens, however, the 16-55 might have been better. It's understandable to try and make sure you're covered for everything but honestly once you're out there you're too busy shooting to worry about whether or not you brought the right lens(es).