9 out of 10 points and recommendedExcellent image quality and very fast AF on an X-T2. Excellent reach for sports including motorsports. This lens is MUCH better in every respect, most notably image quality. than the original Canon 100-400 L IS.The only con I can list is it would be nice to be able to lock the zoom at any focal length so the lens barrel does not rack out to full length when I walk from corner to corner ar the racetrack.
I shot my last professional motorsports event of the year with this lens on an X-T2 with Vertical Power Booster Grip, and it and the camera body exceeded my expectations. At "working apertures" f/5.6 to f/14, and up to 350 mm, this lens is VERY sharp. Also very fast AF. The reach this lens provides is impressive and I shot almost all of my racing images that weekend with it. Those are images are available for review here: http://imageevent.com/puma_cat/indycarsonomaraceway2016;jsessionid=m345h8us04.cow_sreviewed November 18th, 2016
BTW, guys at Imaging Resource, I think it's time to upgrade your reference Fuji X-camera. And X-E1??? Seriously? Time to get on the program...