Just a look at the 75mm lenses sharpness at f1.8.
It is reassuring that the lens not only offers the equivalent reach of a 150mm on a full frame, but also this is with f1.8 speed and is this sharp wide open. Basic processing was added on import, then the blue/green camera channel push talked about in the last "thoughts" post.
This is one of the biggest benefits of M43/43 format.
I really like the 40-150 zoom for some things, but this is surely my best lens. The bokeh in particular is consistent and excellent, where the zoom can be a bit busy to the point of being a concern in some circumstances. It is often pleasant at closer distances, but at middle distances with a busy back ground can look a bit like some older Nikon teles I played with a while back showing strong cross eyed or double image (Ni-Sen from memory?) bokeh.
I remember that this is almost the same dynamic as the 70-200 f4L and 135f2L Canons. The Zoom was often on par with the prime in perceived sharpness and definitely more versatile, but the bokeh was a bit hit and miss (better on the "IS" version apparently) and it lost 2 stops, just like the Olympus combo. The big difference is in weight. The 75mm Olympus is basically the same size as the 85mm f1.8 Canon, roughly half the volume and weight of the 135mm, while the f2.8 zoom is about the same size as the 70-200 f4 and both are a lot lighter than the 70-200 f2.8 Canon, so more reach/speed for the weight/size/price.