Finally did the update for the new X-H1 firmware yesterday.  Here are my first impressions: Autofocus in AF-C is leaps and bounds better.  My test shots on some birds and physically walking up to and away a moving subject were very good.  Using the 16-55mm zoom lens it was able to accurately track my wife walking around the yard watering plants while I slowly walked from one end of the yard to another. Auto ISO transitions are super smooth and almost imperceptible. While I rarely