I got the 28-135 as the kit lens with my 50D and thought of it as a "normal to 200" that went nicely with the 100-400 I bought at the same time. But I lacked a wide angle and had to use my Minolta bridge camera for a while when I had to go wide. Added a 10-22 in six months.
Got a 5D3 a year ago with the 24-105 kit lens. Would rather crop the 105 f/4 down to a 135 f/4 than shoot the 135 f/5.6. And there is no way to "uncrop" the 28 to a 24. Since I now own the 24-105 there is no way I would buy a new 28-135 f/4 L or even a 24-135 f/4 L. don't know how heavy an f/2.8 version of either of them would be but probable more than I would want to carry for what I shoot.
« Last Edit: April 30, 2013, 08:27:29 AM by Jim K »
EOS: 7D (2, 1 gripped), 50D gripped, 580EX II + CP-E4
EF: 500 f/4L IS, 100-400 L IS, 70-200 f/4L IS, 28-135 IS, 1.4x TC II, EF-S: 15-85 IS, 10-22
5D3, 17-40 L, 24-105 L, 24mm TS-E II. S100 p&s