I took the Atoll out today and was, once more, pleasantly surprised. It's a pretty big and quirky lens (smooth aperture ring, focus ring very close to the camera ...), but optically, it can hold its own. It's a shame the light was very dull today - the lens is sharp wide open, with surprisingly smooth transitions, and good rendering. The most astonishing thing about it is that in many cases, images look almost mundane because the lens is so well behaved - not "Lomo" in any way, but also, not as spectacular as one might think.
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I was about half a step away from the lowest step, and even though the angles are exaggerated, lines are pretty straight where they should be ...
While it's not a super-cheap lens (and big!), I think it's ridiculously good for its price. And, as mentioned, it comes with a usable viewfinder that's surprisingly accurate.