Upload & Sell: Off
The 18-135 STM on a 60D on does not seem nearly as fast as the USM in my EF-S 15-85mm IS USM and 7D. I didn't directly compare it to my 5D2/24-105L but my gut feeling is the 15-85 is slightly faster focusing than the 24-105. I ran the 18-135 from close focus to infinity several times and it took a second or slightly longer. In this same extreme situation, the 15-85 and 24-105 are so fast focus appears almost instant. For focus tweaks of a few feet at mid distances it is hard to tell a difference.
The 18-135 is among the ugliest lenses I have seen. Even uglier than the 15-85! Looks just like a goth travel mug with rubber grips for car use.