Nur Gutes zumindest nicht, bei photozone wird es ziemlich verrissen:
http://www.photozone.de/nikon_ff/621-sigma70300f456osfx
Fazit:
"So, unless one really wants the smallest lens in this market segment, it probably makes sense to spend a little more and go for the Nikon 70-300 VR or the Tamron 70-300 VC instead, both of which perform better in almost any regard. "