maybe I have to high exspectations, but after playing with the 17-55mm F/2.8 3 hours straight, I'm still not satisfied with the quality.

At least not for the amount of money I paid for it. It is razor sharp at F/4 but at F/2.8 it seems kinda soft or has slight front focus. I think I give it a rundown over the next week and if i'm not 100% happy at Sunday I send it back and get a refund.

Which translates into the original combo of two primes, which are less convinient, but much cheaper and smaller.

In the worst case I loose 30$ shipping, which is a fraction of what it would cost to rent.

experience so far:

• + excellent build quality
• + wonderful CA handling, nearly perfect
• - not possible to shoot into the sun with it
• + razor sharp at F/4
• - kinda soft at F/2.8
• + very precise focus and very fast
• - a touch large and heavy
• + beautiful out of focus rendering

bunny on the left is 2.8 on the right is F/4