I've read that about the sigma 105 as well. Not a good idea to go for the sigma at all.
I'm only getting strong advice from everywhere to go for the nikon 105vr.
I will stick with that I think. I'd rather spend a bit more and being happy with the lens without any regrets.
It's hard to find any reviews on that lens though. It's a shame. If anybody who have got that lens, want to write a review on pixalo please? It makes live easier for newbies like me