OK, you knew it was coming
I will say that all the pics look good Jaime. The lens is really worth the money.
The only things I see that I would have tried to do different are:
Pic 1, you were shooting towards the sun so there is nothing you can really do there. I would probably put it in PS and play with the curves on it to brighten it up a little.
Pic 2, The PL filter would have helped here as you are getting a little reflection but not much.
Pic 3, fine
Pic 4, just a little tilted but great pic
Pic 5, Would have liked to see the whole motor, here again good shot-colors right on
Pic 6, sunsets are hard to shoot. Good job on this one. A little time in PS with the curves and it should be perfect
Pic 7, good shot.
Pic 8, very nice shot
Pic 9, Have everything centered instead of the last sign cut off.
Pic 10, very nice, great capture of the colors
Pic 11, another great shot.