24-105 F/4

I am using it with my 5D Mark 3 ( came as a kit lens ).  I would say, its one of the better walk around L glass out there.  I have used it indoors with some fill flash, it produces nice images.

CA  is there but i shoot RAW and have to PP the images anyway ;).

2.8 would be nice but will add weight and price to it. ( want neither