05-17-2011, 10:46 PM
I have both for about a year. The 135/2 is better for portraits. No surprise here. AF is faster as well. However, now that I have to sell one it's the 135 that'll go. Reason is simple: The difference as a portrait lens is not that big and IMHO the IS makes it a more versatile lens, even with the one stop disadvantage. If IS is not so important for you then buy the 135/2 and a 12mm extension ring.
Please note that I find IS very valuable in any lens and that I don't shoot portraits for a living so these factors affect my decision. If any of these would not exist I'd sell the 100/2.8 IS instead.
Please note that I find IS very valuable in any lens and that I don't shoot portraits for a living so these factors affect my decision. If any of these would not exist I'd sell the 100/2.8 IS instead.