That was the Sigma 120-300 that I used. Image quality is not up to the Nikkor - but don't take that poorly. The 120-300 is a top-flight lens, but a zoom still doesn't match a prime, especially when the 300/f2.8 may be one of Nikon's two or three best lenses on an absolute scale.
_____ Brian... a bicoastal Nikonian and Team Member
My gallery is online. Comments and critique welcomed any time!