I've been using my Olympus OM-D E-M10 + Olympus m.Zuiko 75mm f/1.8 lens as my telephoto option for the last two days and it's confirmed to me that this is the sharpest m4/3 lens I've ever used and indeed one of the sharpest lenses I've ever owned. It's often the case that it's difficult to see how one lens is 'better' than another, but there are no such difficulties with this 75mm. It's clearly a step up from most other lenses (in any format) and the files it creates are scary sharp.
It's always made me wonder why many other Olympus m.Zuiko lenses turn in pretty average performance with regard to sharpness. Maybe size and budget constraints are responsible for this, but it is the case. For example I've looked at lots of samples, both jpg. and raw, of the m.Zuiko 40-150mm f/2.8 lens as I was thinking of getting it, but those samples aren't even close to what I get from my 75mm. So buying and using the zoom would always be a disappointment as far as I'm concerned.
It's remarkable the amount of detail and micro-contrast that this lens comes up with and that allows me to dramatically upsize files taken with it. And if all m4/3 lenses were this good it would be game over for every other mirrorless system. It really is that special.
Fitted to the E-M10 it's a light, small, quality option for my Sony FE cameras, my Leica T, my Sigma DP2 Quattro and Fuji X100s cameras (plus my phones of course), none of which I have a 'native' telephoto option for. In the case of the X100s, the phones and the Sigma not really surprising since they are fixed lens cameras. And it's also such a useful lens because I don't see any of those other manufacturers coming up with a 150mm f/1.8 (35mm 'equivalent') anytime soon anyway.
I'm currently attempting to see if i can work out some easier way to take it with me on a regular basis, because it isn't that easy carrying around two camera / lens combinations, no matter how small and light they might be. However, I am inclined to persist doing what I'm doing because of the image quality this lens produces.
I would go so far as to say that this lens is possibly one of the primary reasons to use the m4/3 format. And if you use m4/3 and have never tried one, then you should take the opportunity, if possible, to somehow find a way to take some shots with one. I have no doubt that you will be mightily impressed. A modern classic.
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There is an interesting article on the BBC website HERE, which deals with many of the issues above.