It's quite interesting reading Darcy and Elizabeth together. They both share a directness in speech that is striking after considering Miss Bingley:

"Certainly not."
"But it must very materially lessen their chance of marrying men of any consideration in the world
Whatever bears affinity to cunning is despicable."

I am not a great reader, and I have pleasure in many things."
"I am no longer surprised at your knowing only six accomplished women. I rather wonder now at your knowing any."
"I never saw such a woman. (chpt 8)

These direct lines make them both come across as confident in themselves and their judgements of others. Though at least Elizabeth and Darcy have no problems in acknowledging uncertainty where appropriate:

"It would not be easy, indeed, to catch their expression (chpt 10 - Darcy)
I hope I am not one of them. I hope I never ridicule what is wise or good. (chpt 11 - Elizabeth)

They also have a way of trying to clear up other people's arguments:

"You expect me to account for opinions which you chuse to call mine, but which I have never acknowledged. (chpt 10 - Darcy)
"You quite mistook Mr. Darcy. He only meant that there were not such a variety of people to be met with in the country as in town (chpt 9 - Elizabeth)
...but depend upon it, he means to be severe on us, (chpt 11 - Elizabeth)

Elizabeth does tend to show more energy, and lightness than Darcy. She produces more exclamation marks and cries - indeed I haven't spotted one ! or "cried" in Darcy's speech yet, though that may mean I've just missed it:
"You are a very strange creature by way of a friend! -- always wanting me to play and sing before anybody and everybody! (chpt 6)
the efficacy of poetry in driving away love!" (chpt 9)
You have only proved by this," cried Elizabeth
"Oh!" said she
(chpt 11)
"Mr. Darcy is not to be laughed at!" cried Elizabeth
"That is a failing indeed!" cried Elizabeth
(chpt 12)