Wow! Nice shot of this fabulously beautiful church! The colors are beautiful and you show us many wonderful details from the decorated domes to the arches and spires. I am not quite sure that you needed to include the buildings off to the far right into the shot as that this church is the main focus of your composition. It would strengthen the visual impact to just have the church dominating the photo with no other buildings distracting the eye's attention away from it. The other thing that tend to distract is that the building seems to appear to be leaning back away from us. There is a simple trick when focusing the camera to help it 'see' the image as we do to avoid the leaning building capture...darn it can't seem to find my photography book that talks about correcting that problem (have to get back to you on that)
This reminds me of our family trip to Russia a couple of summers ago. We took the train from Moscow to St. Pete. It was just fantastic. maybe I'll dig out a shot for this challenge. This is fantastic.
ps .. that tokina sure does ROCK .. !!
it was a toss up for me a couple of months ago, between the 11-16 that you have and the canon 10-22mm .. i've very happy with the 10-22 tho .. :)