I think you'll find most people have tried one or the other (the f2 in my case) and you'll just have to do some pioneer work and let us know the answers...
With regard to the f2, reviews haven't been entirely kind over the sharpness & distortion wide open. However, I used one as my prime lens for around a decade on my OM-4 and never had a problem.
It must be said, however, that I mainly used it for street photography, landscapes and non-critical shooting. For architecture, macro and full aperture stuff I had a Tamron 90mm f2.5 and a Zuiko 21mm f3.5, so I'm not sure I'd have noticed problems with the 35. Some sources have said there was a lot of variation among copies of the lens, so maybe I got a good one.