Originally posted by mattt So... its a long thread, and tough to search... has anyone done a comparison of Sigma 120-400 vs D-FA 150-450?
Not a technical one, but I owned the Sigma before buying the DFA. The Sigma is a very fine lens, plenty sharp, though not as sharp as the DFA. It handles very well and is smooth and quiet, and in good light snaps into focus nicely. It also works well with the 1.4 TC. Ultimately it's a little slower to focus than the DFA though, and obviously a little shorter. If you don't have the budget, or can't justify the cost of the DFA, which is very expensive now, it's a very worthy lens.
If you search my early posts on the forum, there are a good few pics taken on the Sigma.
Hope that helps.