Olympus EM5iii to OM-1

[hsakols]

Have any of you gone from using an EM5iii to an OM-1?  What appeals to me is the longer lasting battery and perhaps a brighter screen.  I've read articles that the EM5iii / OM-5 focuses more accurately in low light than the OM-1.  Is the auto-tracking on the OM-1 a game changer?  It seems that using a fisheye lens would be less critical.  Yes, I'm sure I'm over-analysing all of this.  I'll be on a liveaboard for my first trip to Indonesia.  Otherwise, I'm diving in the cold waters of the Pacific Northwest.