The pics are at slightly different lenghts and slightly different aperatures and different shutter speeds, The 70-200's shutter speed faster cus of the faster f-stop of 4 compared to the 5.6 on the 15-85. Anyway, the 15-85 looks sharper, this was my question, is that possible or do I have something to be concerned about?
If for some reason you really want to compare these two lenses that barely overlap in focal length...
-Start by setting up a tripod.
-Pick a focal length on the first lens and take a shot at low iso with mirror lockup and manual focus via live view at (e.g.) f5.6
-Swap for the second lens without moving the tripod. Set to the same focal length/framing. Take a shot using the same method and aperture.
The test you did tells you very little about the relative performance of the two lenses. There are too many variables and inconsistencies.