Finally, here is a straight out of camera sample of what I mean by the smooth transition from focus to ooF. I found this little blossom in the forest floor detritus last week in Virginia. All of the loose sticks and bare branches of late winter/early spring are a bokeh challenge, but I think this shot demonstrates how effectively the Tamron handles this, particularly for a mid-range zoom.
P.S. I've attached a fairly large image (2000px on the long side) so that you can look at it more closely.