I would give the slight advantage to Thor. I would say so ... 6/10.
(Was it Pre N52 Superman, then he would win in my opinion due to some impressive speed showings)
But since this is the N52 Superman, it's more like this ...
Superman's advantages over Thor:
1. Superman is naturally simply faster than Thor and can use that to his advantage. He is "so much faster" that in theory he can pick his shots and aim for Thor's chin, which increases the chances of a knockout much more, but that is partially also depended on luck, so it's not a criteria.
2. Superman might be stronger judging by the ridiculous 5 days Earth bench press feat. Thor simply does not have such a strength feat and not even his Midgard Serpent feat comes close to that, so in theory Superman might be able to overpower Thor physically by holding his arms and maybe even breaking them.
But with that being said, it doesn't man that his overall damage output is higher. In fact it's not... It has been stated multiple times in the new Superman comics that Superman's non-holding-back damage output is enough to topple mountains, which is something Thor should be capable of taking.
But then again - thanks to Superman's speed advantage he can travel a certain distance in a short amount of time to gather momentum and strike Thor with even more impact.
Superman's disadvantages over Thor:
1. Superman's durability / invulnerability to magic have not been established yet. He has some interesting durability feats like taking shots, which sent him across the globe and stuff like that, so he certainly can take a punch.
We've also seen him tanking 50 GW electric shocks, AFTER being weakened by a bunch of 5D imps in forms of angels (or did I just dream that?), so his durability against substained damage is also quite high - especially when it comes to electricity, but ...
Thor uses magical lightning and we've seen Superman struggeling with magic BIG TIME! He has been taken out by Oceanmaster and he has also been BADLY cut by some magical thingies, when he was together with Wonder Woman somewhere in a different dimension, I don't even know, but they also had a magical background, so Thor's attacks might be able to do a lot of damage to Superman.
2. Superman's morals ... DC tried to come up with a more corny and badass Superman, but in the end of the day he still has his morals and it's always questionable how he would fight in character. I don't see him ending the fight in a quick manner. Thor is simply too durable and experienced for that and if Thor tags Superman even once, I see him doing a lot more damage to Superman than vice versa, due to his ridiculous damage output as we've seen it in his fight against Gorr - and also the added magical damage from Mjolnir, which also grants Thor a great amount of versatility and if both characters are fighting to the best of their abilities Thor has a big advantage thanks to Mjolnir.
Not only could Thor take the Heat Vision, without any problems IMO, since he has been in the Sun before and supposedly absorbed a blast 1000 hotter than the Sun.
Final conclusion:
Sentry beats them both at the same time.