There is no artist in any generation like MJ so it's a mute point.
There is no comparison to be made between JT & Mike besides the fact that they both sing and dance, you did the same thing with Usher.
If you want to talk music Off The Wall, Thriller & Bad. Justin's work cannot stand up to any of those albums, Justified was filled with production that MJ turned down.
Timberlake is a big artist but that =/= him being this generation's MJ, he hasn't had close to the same impact and never will.