Not sure if you were asking Steen or generally. My .02 on the 135 DC: Great lens *IF* you get a good copy. Some have been problematic regarding holding lens alignment; the elements are reportedly too heavy for the DC mechanism to hold them well over time plus jostling. IMHO the 105 is the better DC, and in that I own one, I basically NEVER use the DC feature! So if I were doing it again, I would probably get the 105/1.8 AFD instead -- but since my 105 DC is so nice, I'm good with it. For that reason, if I wanted a fast-ish 135 I'd go for the Sigma. HOWEVER, that now said, the 180/2.8 AF-D is a remarkable lens at a great pricepoint, AND I much prefer the 180 focal to the 135 for compressed portraits -- and since I own the 180 I have zero interest in a 135. All meant respectfully, YMMV and this is my .02 only!