I just got it and I just started taking pictures with him and my EOS 7D also just bought.
First photos, impressed with the sharpness and brightness, you can smoothly take photos indoors without using the flash and the quality thereof is not affected, autofocus 7D does "patina" no, even in the dark !!!.
I have not seen any vignetting on the small 17 mm focal length, but hey I have not done a lot of pictures.
Beautiful blurred background (I rediscovered the pleasure of fine portraits).
The zoom range is ideal and widely covers the most common needs.
To have long hesitated with the 15-85mm kit comes in, I do not regret my choice.
If you can go financially on a bare housing and buy yourself this objo apart (even if it is expensive: more than 800), I assure you that you will not be disappointed !!!
On the negative, it is expensive (but hey it's the Canon, you will not find better objective APS-C or transstandard f2.8 Sigma or Tamron and as the saying adage_cf. Tontons Flingueurs_ "The price is forgotten, the quality remains "), the lens hood and the cover is not provided (what Canon pettiness, yet this goal largely deserve the L attached).
Another thing, if you offer this gem, equip the office with a UV filter (preferably Canon, is the top), in fact it would prevent the infiltration of dust in the lens (default objectifs_allez known about and see some of the part dedicated to the objectives of PlanètePowerShot forum).
And finally, I will tell you the mishap that happened to me with the delivery of this objective by Amazon:
So I get my package (in time) with objo, the Canon lens hood and Canon UV filter (also decidedly).
UV filter and visor OK, but when I open the packaging of the goal, I realize that it has already been unwrapped by someone, the AR plug was screwed through and forced ( I did not believe unscrew) and especially that there is the famous dust in the lens (lens used ???).
So neither one nor two, and then use Amazon SUPER SUPPORT by the attendant:
Editing a good Colissimo for the return of the lens in the package (no additional cost), followed by messages of all the procedures of return and receipt by the Amazon platform.
Paid by bank transfer within a week after my initial receipt.
In the meantime, new order of the same target delivery "flash" this time (commissioned in late afternoon, received the next morning before 10 am), opening the package and this time no problem (no dust, not unpacked anything).
So in conclusion, make sure the front desk if your goal is in good condition (dust), do not hesitate to bring a UV filter and above:
YOU CAN TRUST TO AMAZON FOR ANY DISPUTE (it says in capital letters and without restraint and no, I am not an employee of Amazon, but only a satisfied user of the services of the site)
I wish you as much pleasure as I have to shoot with this gem!