[hef19898]

My main one, a D700 on "extended loan" from my dad, was used in Iceland in winter (multiple times), in pouring rain, near the Atlantic shore during storms, in the Sahara during dust storms and 45 degrees C, used professionally for event documentation... And that's just from top of my head. Still shoots 10ish fps with the battery grip, has no sensor issues, is still weather sealed and just works.

Same for the old F4 sitting in a shelf, or the D750 that replaced the D700 for my dad. I have no reason to doubt Canon is any different (during a lot of those trips other people used Canon, and those held up just fine as well), nor do i have doubt the new mirrorless cameras will be any different. Unless you dump them for prolonged periods in salt water after having them run over by a truck and store them in a warm and humid environment without drying.