I love my 24-105 for wedding especially for low light contrary to most people’s belief. This one is at f/4.5. The bokeh is good enough for me. If I want something smoother I will go for my 85L or 100/f2.0

All these blanket statements as if ISO is locked as for film - Wow! We have three variables these days guys. Trading down depth of field for the sake of stopping motion (when brides want their processionals and recessionals sharp) is not necessary if you have a camera like the Canon MK III or Nikon D3. (If you are not making enough at wedding photography to stay competitive with current equipment, you might need to reconsider what you are charging, by the way.)
Solemn processionals aren't exactly track and field events. Stabilization is icing on the cake for everything else. You are using the latest pro equipment, right?

Another question is: Can you do your part to handhold down to the shutter speed that matches your ISO/ f2.8 combo? Camera shake can be a very significant factor in the tension and anticipation and haste of getting the shots - especially so to someone new to the business.

Test yourself at 70mm, on a 1.6x crop camera at 1/30 sec with your best low noise ISO, then take the same shot with a tripod. It's enlightening.