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Daan -- This type of haloing is common on high contrast areas, even with high quality fast primes (f/2.8 and faster) when shot wide open. It radically diminishes when stopped down one stop (sometimes even 1/2 stop) less than wide open, and is usually gone completely by two stops. Your lens performance looks "normal" for the lens -- in other words, exceptionally good.
Certainly check with Canon if you have concerns. If there is a problem it will get fixed under warranty.
Looking forward to more examples, and your feelings about the lens IQ.
I didn't expect this. I have other lenses that show fringing wide open, but never with so much decrease in contrast. So, it basically falls under the category of fringing? Indeed, stopping down resolves the issue completely.
Here is another set of 100% crops (area in focus). Would you say, based on your experience with the lens that this looks normal, or even exceptionally good? Images are RAW converted in LR3 with default values.
35mm seems to be the best, as is 16mm (no samples included). 28mm the worst. In low light this isn't as much an issue as it is in hard contrasty light.