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A lot of my shooting is done at iso 6400, (and then recover the shadows!). The fuji just seemed to handle that better.
What was your experience with it?
Well I can't claim to like ISO 6400 on the EM1, but then again there aren't many cameras that I really like it on. The X cameras do a little better of course, but with the EM1 you also have IBIS with any lens, so that's also a factor if you're shooting still life.
Another small point - Fuji "cheats" with their ISO ratings.
Take, for instance, an metered shot at Iso 6400 with a Fuji X camera and an EM-1, for instance -- the EM1 is going to give you a faster shutter speed, even if the cameras have the same ISO and aperture settings (this is discussed several places and I've tested it myself).
In rough terms, Fuji's ISO 6400 is really around ISO 4000, when it comes to determining a shutter speed. YMMV of course.
As far as raising shadows - both cameras seem to do it fairly well, though I haven't shot much ISO 6400 then raised shadows.
Also, be aware that with Lightroom, sometimes it'll induce an ugly shadow shift in higher ISO files and certain cameras (and it does this with the EM1, unsure of the XT1-- the EM1's shadows get this nasty magenta tint, but only at high ISOs), so be careful if you're comparing high ISO shots with lightroom - try another converter first like Capture 1, etc.
Anyway, if I was constantly shooting higher ISOs, I'd probably pick Fuji over EM1, but they're pretty close.