Fine, For sharpness then
But theres more to a lens than just sharpness, For instance, bolting it on a tripod is well and good, but if its a general purpose walkaround, things like how does it handle, and how sharp is it when handheld [By someone good at it] are also important
The 15-85 is designed to be a walkaround-type lens, ie, its usually going to be used handheld, thus im interested in seeing how it works handheld using its 4-stop IS, Not bolted on a tripod
So, we have to trust your ability to hand hold the lens ? If so, i'll pass. It might do for a general idea of the lens, but not for a good review.
True there's more to it then sharpness , but that will also come out when mounted on a tripod.