So I personal own the 30 1.4 which at the time of the purchase was the only lens available for low light shooting. Now that the 35 1.8 has been out for a while and I have seen some pics on it....I am starting to wonder... which is the all around better lens? And if anyone has both it would be great to test the actual low light abilities of both. I would suggest with a auto iso set up on the camera, and set but lens at f/2. Then record the readings of the auto iso output, and keep opening it up more till it goes to 1.8 and 1.4 and this should tell if the Sig 30 1.4 actually has a low light advantage over the Nikkor 30 1.8? So what do you vote for the better lens to own?