THOR vs LOBO

has this ever been done before?

Good fight.
Lobo's immune to magic though, and you CAN'T hurt him physically. He laughs off world ending attacks like it was a 3 year old hitting him.
Then anytime he would bleed he makes another Lobo.

That would probably give him the edge over Thor.

mid 90's Lobo?

h2h- Lobo.

With the hammer, Thor by probably just banishing him.

If Lobo has his clone ability back, like has been mentioned before, then Lobo wins both ways.