I bought this lens about 18 months ago just for taking vacation-pics. I use it most of the time @24mm. Unfortunately the sharpness - especially in the corner - is even worse than a cheap 18-50 or a 28-90 (kit). I tested it @ 50mm against my 50/1.8 MK II. The latter is even @ f=1.8 sharper than the 24-85 stopped down!
Probably I got a monday model!