(Part 2 will have to wait until after the weekend.)

I knew it was going to be nice. I knew that, theoretically at least, the autofocus was going to be faster, quieter, and more accurate.

Digression the first: Focal lengths, f-stops, photon density, and autofocus.

This gets long, and there is a little math... )
The short story: Oh. My. God. What an *awesome* lens.

Related topics (will add links when associated articles are written, or you can search on my “photography” tag):
Focal lengths, f-stops, photon density, and autofocus
What the hell is "bokeh"?
Depth of Field
Camera shake and motion blur
Using the flash (Yeah, right! As soon as I figure it out myself…)
Film: Reciprocity failure
Expanding depth of field with Photoshop
Digital: The histogram is your friend