I think most of those Wimbledon quarterfinals, semifinals and now final have quite one-sided scorelines. It was just like a previous match didn't show at all. For instance Alize Cornet won Serena Williams, but lost her next match. Angelique Kerber won Maria Sharapova, but lost her next match too. Eugenie Bouchard won Simona Halep quite convincely, but today she looked hopeless in the final.
What comes to Petra Kvitova, I think her success remains me a little bit how Marion Bartoli won her title in Wimbledon last year. Both Petra and Marion had a pretty poor season before they won in Wimbledon. I am not sure if this means a new sort of consistency to Kvitty.