My first thoughts....
- Better than the older version which sucks in the 24-35/37mm range - I sold my old one in late 2009 because of this.
- Current version is very sharp in the 24-60mm range.
- Softer in the 70mm range - but maybe nice for portraits because of this.
( no mater I have ample portrait primes if I want to see hairs and skin pores. )
- Vignettes a bit at f2.8 but I don't mind it and can be corrected if one doesn't like it.
- Nicer to shoot into bright light sources.
- Color seems a little dull... well thats prob the haze or I'm spoilt by my ZEISS Primes.

( I want BLUE SKIES !! )
- Focusing is awesome fast! Much faster than prior one - I'm liking it.
- Lens is big - two people saw me thinking this is a 70-200.
- Even though size is big, it handles very nicely ( Pro lenses should be big as they sit in hand nicer IMO. )
- May want a new deeper shoulder bag... did I say its big?

- Hood is very tight when you have a filter or lens cap on... maybe a few weeks will de-virgin it.
- This lens is cheaper here in Singapore than
many other countries !!
YAY!!