Canon 15-85 vs 18-135 STM, What am I missing?

I love my 15-85. The IQ is fantastic. I bought it as part of the kit with a 7D. I could have had the 18-135, but chose the 15-85 as it fit in with my 70-200f/4 IS. I just thought the 135 was too much of an overlap, & the IQ on my 15-85 is very close to the 70-200L.

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lee uk.
There are old pilots, & there are bold pilots, but there are no old bold pilots.