have there been improvements to ai?

pretty simple question:

does the ai play more clever now as in 1.0 civ5?
Overally - does it fight more clever and pririzise wonders and other stuff better?

Not talking bout the diplo part, pathfinding and other things which seems just bugy rather then ai problems

Yes, in some ways, no in others.

The AI seems to get to more wonders bc they beeline for technologies and skip into eras. Each AI will take a different beeline, so that means that at any given time, you'll have at least 1 AI even or ahead of you on a lot of wonders.

The combat is a bit more clever bc the AI will hold back a large number of its forces in its territory to play defense instead of blindly rushing its whole army in like in vanilla. It still gets soundly defeated in even combat by a good player, but its grand combat strategy is far better, although not perfect.

The biggest changes to the AI seem to be those that work on a large-scale. Micromanaging things like pathing and diplomacy haven't really imrpoved though. The only major diplomacy boost is that the AI will be more friendly longer (I've had games last into the Renaissance where not a single denouncation occured worldwide). But they still backstab and act irrationally all the time.

Definite improvement overall from vanilla though.