I have to say I wasn't blown away, but it's not really the fault of the lens, more my expectations.
1). It's sharp, but not mind-blowingly like the 24-70
2). It's a weird range on a crop body - not very wide to not very telephoto
3). Minimum focussing distance isn't that close either so not good for 'macro' photography
I'm not having a go at the lens, it doesn't at any point say it can do any of the above, but I learnt the hard way, bought one and just didn't get on with it!
Cheers,
James