cgarrard: Does sound decent afterall. I'll be honest, my first thought was "sheesh, really Sigma, yet another redeux of this lens???", but after reading the specs etc. it seems like a legit replacement/update and a decent performer.
I'd need to see its optical improvements (if any) and AF speed, build, before coming to a final conclusion, but on paper it seems pretty legit. Bit slow on the long end though, especially with Nikons recently announced 18-300mm f/3.5-f/5.6.
Commandment No. 5: Thou shalt realise that consumers buying superzooms and other low end gear by the pallet-full pays the R&D for the awesome gear we like to buy
For me personally that would be unusable.
Jack of all trades lens.
And yet Sony's (formerly Minolta's) 500f8 still autofocus' with no issues. Yes, I know it's a one of a kind but it works on all a-mount cameras. So clearly, they can AF at f/8 ...
Nicely done, the bokeh seems to work on this background.
As an aside, you need to be careful. If you were to use this photo professionally, I know from experience, there are some nice big fees that you could be up for. Mostly it seems, to discourage use.