The noise at higher ISO levels isn't terribly realistic for modern SLRs, let alone full-frame pro SLRs.

Here's a comparison of several modern entry-level SLRs: http://www.dpreview.com/reviews/nikond5100/page20.asp

You can go up to ISO 1600 and get (more or less) unnoticeable noise.

Note that you have to switch to RAW to show sensor noise-- JPEG mode will blur away noise, trading fine detail for smooth images.

Also that lens is really amazingly sharp at both ends of its aperture range. In the real world you wouldn't get anywhere near that level of performance without spending tens on thousands of dollars on a prime (non-zoom) lens.