I thought the revision 2 is just to help it deal with flare, but tbh I haven't read very much about the new version. I can't speak for the 14mm Rokinon, but I have the 8mm f.35 fisheye and I wish I hadn't bought it. The manual focusing is fine and the images are decent (though I don't like the colors). The big issue I have is that the lens gives to exif info and I have no way to read what I've done after the fact. All my other lenses at least tell me what f-stop I'm at and it makes learning from mistakes much easier. I for one would pay the extra for the tokina, but I'm sure you'll be get nice pictures with either choice.