I have two EM1s and the EM5 Mk2, have used them hard for photojournalism, macro and extreme macro work. I have the HLD8 grip and battery pack on the EM5 Mk2. I use both with an array of 4/3 lenses, the 12-60 2.8-4.0, 50-200 SWD, 70-300, and 50 2.0 Macro, 1.4x extender, along with extensive time on bellows with many lenses. There are also the incredible little M43 lenses, I love to use them too.
Sometimes, the autofocus does hunt. Sometimes, when I'm shooting one particular face or bird in the middle of a crowd or clutter, no autofocus on earth could know exactly what I want to pick out. Then, I use manual focus with the highlighting focus aid. It's marvelous.
I've done photojournalism since everything significant had to be shot with a 4"x5" Speed Graphic. I long ago learned the valuable lesson that the image is everything, not some detail of camera design, and that training of my eye and mind were the most critical tools I could have. The M43 Olympuses are spectacular cameras. The feel better than any camera I've ever used, allow me to grab images I could never have gotten before, and I have exhibited 20"x30" prints from the EM1s that have garnered all kinds of admiration for image quality, NOT ONE criticism, and these images were beside ones shot with a Nikon D800e, carefully used.
Am I incorrect in believing the November, 2015 firmware upgrade to the EM1 enabled high resolution images? Could have sworn it did, that I have used that on my EM1s, but perhaps I'm not remembering correctly?
In any case, the silent shooting mode allows me to make photos in classical concerts without disrupting anyone, the spectacular IS enables hand holding long lens shots at many times their rule-of-thumb-minimum-shutter-speed, the light weight means I feel more like shooting another image at the end of a 12-hour day, and even high ISO images, if the content is strong, are fine in spite of the noise.
Were I to pick one feature that bothers me on these gems, it would be the plethora of rank amateur features I have to work around, to get the essential functions I need for serious photography. So many of the little cutesy, artsy capabilities are irrelevant to what I do, but perhaps someone, somewhere uses them. In any case, I can set the cameras to do what I want under Myshot, IIRC, and as long as I have all three cameras set the same, confusion and frustration in the field are minimized.
Used faithfully and intelligently, these will provide many years of superb images. The ultimate controlling and limiting factor, my friends, is what YOU do with them, your perception, and your ability to make that visible.