Last Ray -- NEX-5 & OM 35mm f2. Click for larger.
I have had used the Olympus OM 35mm f2 lens for a little while now after swapped my SMC Takumar 35mm f2 with Adam. Over all, I am quite happy with the lens. Not a great deal of difference with the SMC Tak 35/2, but the Takumar is slightly smaller in diameter (49mm vs 55mm filter size) but longer lengthwise. If I had to choose, I would choose the OM 35mm f2. Not sure why, but I think it might be because I have had many many Takumars over the years, but hardly any OM lenses other than the 50/1.4 and 100mm f2.8. In any case, I am having a blast with the OM 35mm f2.