The Dark Knight wrote in post #17094681
I had a chance to use the 24-70ii for a while recently, and I kinda agree, the DOF wasn't as thin as I'd like (when I'm specifically going for shallow DOF) and wasn't a huge different from f/4 imo.
With the versatility and range of the 24-105, that and a high quality prime lens may be my best option.
The 24-70 II is a wonderful and very useful lens, but is not a "fun" lens, and is not going to please you if thin depth of field is what you are going for.
If you can, as others suggested, try out the 135L to compliment your 24-105. It is a fun lens, and good for outdoor events and portraiture. If you do indoor events, it may be a little long (and lack of IS may be a challenge in some conditions, if you are used to that).
If you like 50mm as a focal length (or if you are doing a lot of indoor events), and want thin depth of field, then i think the new sigma art is the best you can buy at the moment. Ive used both that and the 50 1.2 and unless "creamy creamy bokeh" or a red ring are your absolute and non-debatable #1 priorities, I think the Sigma is the better buy.