Ehhh.... but the 135L f2 is a totally different lens. You can't make the same images with the 24-105f4. You're right about ease and simplicity of having an all-around zoom for travel, but that can't replace something like that particular prime for portrait work or even artistic shots that beg for super shallow DOF with unmatched bokeh. Really depends if you were just shooting general stuff or even landscape things, then yes I'd take my 24-105 tooI've done a month-long vacation with the 24-105/4IS (EF, MkI) and the 135/2 and ended up literally never using the 135mm. I think 105 is a good tele end for travel.