Ideally, you have an elliptical lift distribution. I e, if you plot the lift distribution along the wing, you'll end up with one quarter of an ellipse. With this lift distribution, you get the best efficiency out of the wing. That is why the wings of the Spitfire have the famous elliptical shape even though it is a lot harder to manufacture efficiently.
Most wings are built as compromises between this ideal lift distribution and other factors though.
I thought I was doing good trying to avoid those airport hotels... and look at me now.