jimmy462
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Hi Evangelos,
I'm going to have to edit my previous comments on lens fog, that judgement was based on two things I had not considered while looking at the images on google's site. First, was my monitor's portrayal of the google drive rendering of your 10-22mm.cr2 RAW file. And second, what had also thrown me off were the lighting changes between that image and the 18-135mm.cr2 image...the soft shadow edges in the 10-22 image indicate that a cloud had passed over your proximate scene creating a bluish cast on the shadowed areas, the 18-135 image has sharp, detailed shadows indicating that the sun was shining directly on your proximate scene and the reflected sunlight into the shadows helped warm their color temperature. My apologies, no lens fog here.  
So, I decided to download your files and run them through Canon's DPP software for a better look. And, yep, I'm not seeing fine focus in your 10-22mm images, either.
In my experience with this lens, it is not a stellar performer. Several years ago I did a three-way shootout with this lens (on a 7D) and a Sigma 17-35mm EX DG and a Canon 16-35mm II (on a 5D2) at select and comparable focal lengths and, hands-down, the 10-22mm was the "noticeably worst" performer of the lot. Center focus of the 10-22 never matched that of either the 17-35 or 16-35 and the corner and edge purple fringing and distortion were at their worst from 10-16mm with apertures wider than f/11.
What I am going to suggest is that you experiment with your 10-22 at narrower apertures than the f/5.6, 6.3 and 7.1 apertures in your shared images and see if that will give you acceptable results. Again, from my experience with this lens f/11 and above will likely help you with your center focus, but the edges and corners will still be suffering. wsheldon's f/10 and f/11 images elsewhere in this thread will bear this out...
https://www.fredmiranda.com/forum/topic/1291930/0#12322479
Clearly your 18-135mm is out-performing your 10-22 at f/5.6...and this comes as no surprise to me.
Now, in fairness to those who have met with acceptable results with this lens, maybe there have been some QC issues on Canon's end with this particular lens, and, maybe, it might be worth your while to send your copy back and try another. Who knows, maybe I'm just mistaken, again.
In the meantime you can check out the corners and edges in the wide-aperture full sized images and see what you think, here...
Full-size sample photos from Canon 10-22mm F/3.5-4.5:
http://www.pixel-peeper.com/lenses/?lens=12&p=1
...FWIW, I sent my 10-22mm packing...it's been on long-term loan to a friend...who, apparently has a higher threshold for pain than I. 
Hopefully this was helpful.
Jimmy G
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