I was watching from the new SMF garage the other day prior to my flight. The conga line of southwest aircraft were taking off southbound from the eastern runway. I was estimating the winglet examples were taking off at about 3500' based on the taxiways. It was a warm day and you can bet that those friday afternoon flights were very full. The 737-300s seemed to need about 750'-1000' more. Additionally, I noticed that the winglet aircraft used less distance between rotate and main gear off the ground.
It sure was fun to get a brand new aircraft for my flight to SAN. And yes, we sure did rocket off the ground!