I noticed they were shot at relatively low shutter speed, as low as 1/30th of a second (!!) and they still look very sharp, when viewed at 100%. That impresses me a lot, but it impresses me even more knowing that they were also taken at 200mm, where most 70-200mm tends to be a little less sharp**. It tells me Pentax really made no compromises with this lens.
** Like the Tamron 70-200mm, which although being a very nice lens, and quite affordable too, doesn't produce nearly as much sharpness at 200mm than it does at 175mm for instance. I understand there could be some sample variation, but I'm pretty confident most Tamron don't perform as well at 200mm than it does at shorter FL. I kept my 50-135mm 2.8 for that reason alone. I was interested in a little more reach for wedding photography, but being quite a bit heavier while not being as sharp as I'd like it to be near 200mm, the Tamron wasn't cutting it. I could have looked for a Sigma but instead figured I was actually rather happy with the DA* 50-135mm. If I end up going FF, I'll of course look for a 70-200mm, and being budget oriented, I will consider Tamron and Sigma alternatives.
