18-135 STM vs 15-85
It all depends on if you were "lucky" to get a good (properly adjusted/calibrated) copy. Canon QC is very "patchy", to say the least.
Both lenses, on any properly adjusted/calibrated EOS body, can deliver stunning images. I have both lenses but am mostly using 18-135 at the moment - on 600D body! On the screen and on prints (up to A3) the images don´t look "worse" than from 5DMk2+24-105/4LIS combo.
|Meet at HKCC Rain or Shine by pen araneae|
from Your City - Rain Down on Me
|Pregnancy Is Beautiful by sye46|
from Women's World
|Criss-Cross Traffic by PEB|
from Best Use of Motion
|Picking a Star in the Milky Way by vbuhay|
from My Best Photo of the Week