Just a quick video of an IS-3 competing, and even excelling against Tier X tanks. Let me know what you guys think, of course, don't forget to like and subscribe if you enjoy our content :). Thanks. http://youtu.be/vHO9kY1cPsM
Good choice of cover for the first half; your tank was quite obscured from view. The terrain of the cathedral area also worked in your favor, since you did not have to deal with gun depression problems.
I would say that you may have some luck on your side though; there were not many enemies that were already looking your way in the second half, especially when you were dealing with the T95 and T30.