the XT-2 Autofocus seems to have severe issues with certain fine structures. Just spent many frustrating hours:
I was actually testing lenses on what i thought makes a perfect object: fine twigs against the sky. Set it on a tripod, with the 10-24. The AF is very inaccurate or erratic, at 24 mm i get many blurry images. Same with the super sharp 35/f2, but smaller differences. (No problems with the 56, thats perfect). Also tested it on the X-T1, kind of the same issues.
I might have it repaired/exchanged, and HOPE there's a fix. I'm wondering if maybe the AF System can not "see" fine structures, like fine branches. But it's high contrast against the sky (the rather poor AF on my old Canon 5D2 and 6D never had problems like this). That would mean serious problems with landscape photography...i mean, it's just a usual object. Nothing extreme or difficult for AF. Attached a 100% crop: image to the right is sharp, shot right after the blurry one. I got tons of that erratic sharpness.
New firmware, all 135 AF points activated. Single point focus.
Looking forward to your opinions/experiences...thanks!