With all the love I got for the 16-85, it's time I shared a few pics here:
16mm
16mm
16mm
85mm
85mm
16mm
A comparison of 16 vs 85mm to show the range (not technically the best)
16mm
I find that for me, the main perk (apart from the excellent IQ, plus DC and WR) is the 16mm wide angle. I come from the 17-70, and that single mm at the wide end has made a world of difference.
The longer 85mm also means that I swap lenses much less often. My 60-250 has been the looser in this exchange, since now I feel the need to mount it less often.
My only gripe so far with the 16-85 is that at 16mm, the built-in flash casts a shadow. I'll have to learn not to rely on it, or to always mount my external flash.