The largest change in her temperament since the Perez reboot, I think, was during the Rucka run. Perez's Diana was a somewhat naive optimist. I think Rucka essentially swapped in the backstory of the Kingdom Come Diana for the Perez Diana. His Wonder Woman was always an unliberated and tragic figure, driven to drastic measures by constantly being boxed into unwinnable situations. Rucka's Wonder Woman was care-worn with the burdens of duty, much more solemn and aloof than Perez's.
I do think Azzarello's Diana has more in common with Rucka's than with Perez's; then again Azzarello's run on the book is even drearier than Rucka's. Johns's Wonder Woman combines the worst features of both of them; the naivete of Perez and the warlike nature of the Kingdom Come version.