The first picture is the Tamron at 200mm, focused on my nearest neighbor's house, about 325 meters away.
And here's the Pentax at 300mm.
Very nice for wildlife shots, and perhaps quick pictures of the Moon.
UPDATE: Blowing up the images, you realize the enormous quality difference in the optics.
And remember: the Pentax is at 300mm, and the Tamron at 200mm focal length.
UPDATE 2: A picture my wife took with the new lens of some gladiolas. OMG.
UPDATE 3: And a series of progressively larger crops.
What amazes me is how many of these somewhat older Pentax brand lenses--yet still having the autofocus capabilities that work with the current digital SLRs--are available dirt-cheap on eBay.