I had a very long conversation with a friend of mine who received (one week ago) as present for his birthday "all mighty" 35mm 1.4 Sigma.
He is saying that on close subject ( 1m and closer) the lens is amazingly sharp, but if you try to focus on something further than 3m, the the focus is out of control and for him was imposible to micro-adjusted. He likes the lens so bad that he never think to retur it and in the same time is totally frustrated by focusing.
Anyone else had this problem?
My copy was already very sharp on both close ups and longer distances when I received it, and after AF micro adjustment it got even better, with simultaneous improvement on all focus distances. Your friends copy is faulty and he should return it, which shouldn't be a problem as it's only a week old.