RLPhoto said:
I have found the 85L a strange focal length for me. It's not quite normal but not quite tele. It will melt the background but still leave some information.
Overall, I'd probably never own an 85L since my 135L is just so good. My 24, 50, and 135 kit are all good, separated, and unique focal lengths.
I'd recommend just to continue to use the 135L.
Interesting...that's my take on the 35mm, as in it's not wide enough, and not normal enough. I bought the 85mm after the 24, 50, and 135 because I found the 50 less than flattering for headshots and the 135 was often too long to use indoors. After buying it, I was pleasantly surprised to find that the 85L was great for all of my portrait work other than environmental shots.
To the OP, I'd recommend getting your hands on a 85mm lens (borrow or rent) to try it out for a couple of days. Most shooters (like RL & I) find certain lengths preferable to others and it's a very personal thing. If the 85mm FL melts your heart, then you can decide 85 Sigma or L, and if not, then you can wait for 50 Sigma or buy L.