The 12-100 lens replaces my longtime favorite lens, the 12-40 F/2.8 Pro, and fits my M1-2. Sometimes I miss the aperture, but for stills you get it back thanks to the extra stability. How much extra? The M1-2 IBIS already offers 5.5 stops of stability and I really didn't think the extra aperture you get with the lens would be noticeable until I accidentally turned it off and wondered why I was blurry for a long time get recordings. This absolutely makes a difference when you're trying to get 2-4 seconds (or longer!) of freehand exposure, and extra focus up to 100mm (200mm, FF equivalent) is very handy for a travel lens. I pair it with a 25mm f/1.2 lens when I really need a super fast beast, usually for low light indoor shots. It's also my lens of choice for any type of video, but I use it more for portraits when I have my own lighting and background (and stop being such a bokeh freak). expensive? Yes. Big for an M43 lens? Sure, but look what you're replacing! A 24-70mm and a 70-200mm lens all in one, and smaller than either for a full-frame system. And for the same price as a single 70-200mm f/4. sharpness? It is very good. It's not stunning, but it's very respectable for a zoom lens, and it's already more or less in its best position at f/4. If you don't have a body that works with lens stability, it might not be worth the price. On the other hand, it's still an amazing lens that gives you incredible flexibility at a relatively reasonable size.
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