Hello from a fellow fuji and Canon full frame shooter.
Let me share my experience with fuji:
Consider this. A fuji with a 23mm 1.4 isnt much lighter than a Canon with a 35mm.
Since all fujis use the same sensor, even the xm-1 would do your lenses justice.
Weather sealing is marketing speak i would not rely on. I shot numerous thunderstorms with my 350D + 18-55 and it never left me in the rain (ha!). Ignore the weather sealing nonsense, take reasonable care of your gear and you will be fine.
The fujis do have beautiful sensors (ISO-less).
But ... how do i put this? They are nowhere near as realiable as Canon's cameras. Examples? If a Fuji reaches Filenumber 9999 it will totally lock up and say something like "File Limit reached". Only later did I find out it has nothing to do with the card being full, but only with image numeration (which you have to reset manually - WHY FUJI???). Another example? Set your white balance to cloudy, and the EXIF will not read cloudy / sunny or anything - no. it will say "fine" - actually made me laugh the first time. Still sad because fuji does not seem to put much testing / care into its products. See the delay of the current x-pro2 due to light-leak issues for example. Or the lousy battery door on the fuji X-T1. Munchy buttons on the back. The list goes on. Dont spent too much money on a toy. When you put one of your fuji SD-cards into your macbook, the camera will not be able to use that sd card anymore and will give you some read error. you have to format the card in camera to use it again. this is especially great if you're on vacation.
Fuji lenses are good, but way too expensive for what they are. Most of them have noisy autofocus motors. The images are beautiful though.
The X-Trans sensor maybe good for strong and medium details, but it absolutely fails in delivering the finest details (foliage, esp. nature shots). Iridient developer helps this a bit, but is cumbersome and does not deliver the detail you are used to from a traditional bayer sensor.
The shutter speed dial is also annoying. If you select 1/250 of a second and adjust it to 1/200th. Take your shot. Press the play button to check, take another shot and the camera will reset the shutterspeed to 1/250th of a second, sacrificing image quality.
Auto focus often thinks it is in focus, but isn't.
Autofocus often focusses on the background instead of the object in front.
So why am i still shooting fuji?
The 18-55 has no rivals, it is the absolute king of APS do-it-all lenses. Though mine had to be adjusted (the IS was blurring images with fast shutter speeds and stopping down at 55mm made the lens softer, event at f5.6).
The 27mm is very cheap, super fast and has fantastic image quality. Makes for a superb holiday camera to follow you everywhere around your neck without bogging you down.
I got the X-E1 and 18-55 Lens dirt cheap in mint condition over ebay for 400€. Dont buy new/flagship fujis. Once the hype train is on to the next new model your camera will be worthless.
Another very important but highly subjective difference is the color rendition. Canon's are spectacular in this regard. Nature, people, you name - everything looks just GREAT on Canon - even straight out of camera. Fujis do give a very unique und natural/organic look which is stunning when used for people shots (especially the velvia mode) but less so when used for nature photography where you want to impress with rich, saturated and punchy colors that jump off the screen/print
I think you have to try them out yourself. But do yourself a favor and go cheap first. You can always upgrade later and once the bodies have lost most of their value they hold it pretty good.
And finally, two shots i took with my fuji.