I am looking for an all-around wide-angle prime lens for my OM-D EM-5. I was mainly interested in the 12mm f2 after reading all positive reviews. But I love the 35mm FL on FF and the 17mm f1.8 would possibly be the best lens for this. I would probably to add the Rokinon 7.5mm FE if i decide to go with 17mm as it is cheaper than the 12mm. On the other hand, I like to shoot wide open and the lack of sharpness at f1.8 is a stopper for me... can't decide right now. What could be the best option for the OM-D ?