1: Thor 10/10
2 & 3: Starhawk might get 3-4/10. None are easy wins for Thor, but at the end of the day, feat wise he is going to be more powerful. Starhawk's speed and offensive power are good enough that he'd get a few though.
Being affected by Korvac, neither want to fight eachother, but when they go all out, not only is the depiction that they are equal in power, it literally says as much on panel. The fight ends with neither actually hitting the other and the building falling apart.
For as much as one might argue Thor is holding back or not fighting to the top of his powerset, his depiction is far more in character than is Starhawk's, who is actually fighting in the least effective way he could, and far different than he is normally depicted (FTL blitz + powerful energy blasts).
Anyone who thinks scenarios 2-3 are a stomp or easy wins for Thor is grossly misinformed about Starhawk. Hell, I'd BZ this one I think...
I think at the end of the day, the exotic stuff Thor has outside of his more "typical" powerset probably give him the versatility to put Starhawk down more times than not, imho. It might even just be due to the fact Thor has more appearances and thus more exotic feats.