No, I've never done it. If someone gets to a vehicle before me then it's theirs.
I've had it happen to me though but I never let them have it. Babies shouldn't be rewarded for throwing tantrums. --- "I am many things, Kal-El. You couldn't even begin to imagine half of them. But for now, I shall take the role of the executioner." - Darkseid
My teammate was shooting at me when I finally got into the mantis the first time on multiplayer, I killed him and got booted. I hate doing that to people, especially when it happens to me. If they beat me to a vehicle or weapon then they deserve it. Just that noobs don't understand that yet, they think they deserve vehicles and nobody else does.