I did this really quick while trying out my zbrush trial (first model ever, please ignore the atrocious attempt at facial hair and anatomical mistakes). I don't know how to fix the pixelated look of this. I tried upping the resolution which didn't fix the edges. I also tried the dynamesh feature (well...I forget what it's called now, but it redistributes the polys around - I think you guys will know what I mean). Neither worked. It makes it hard to get the crisp modeling details in there like wrinkles. Could it be because I'm away from home and forced to use a crappy laptop? ie. a graphics card issue? No point in listing computer specs, believe me it's not good at all.
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One set of controls will pan or zoom in on the viewport document, which is just a grid of pixels. This means that when you zoom in, the pixels will get noticeable. Another set of controls moves the model independent of the document.