Yesterday i had read on on some rusian forum about Kyrgystan (?) TU-154 incident. A/C lost about 2 m. of wing during takeoff. They managed to takeoff, go around and land. Looking at thorn wing part picture it looks - there was about 4-5 m. of wing missing, maybe a bit to much.
well I dont know the story , but I can immagine there may be other significant differences between these partial wing loss as fe forces involved during impact (a/c wing vs tree - some rotating torque) and some structural damage resulting in the loss of part of the wing /partial loss of the lift force (only) in the other case - easier and more important - leaving longer time for reaction / control