The Superhero Database Classification number, or SHDB Class, is a number that represents the overall 'power' of a character. All traits of a character are used for calculating the Classification.
What it DOESN'T mean
This doesn't mean that a higher class would always beat a lower class character. But the bigger the difference in Class is, the more obvious it is who'll win in a fight.
How is this calculated
( INT^1.3 + (STR*0.5 )^2 + (SPE*0.5)^2 + DUR^1.6 + (POW + (SPS*SPL))^2 + COM^1.8 ) ^ TIER
Super Power Score and Level
Every Super Power has a score (SPS) that is used to calculate the Class. Each Super Power also has 3 levels (SPL). The level is set when connecting that Super Power to a character. The level determines the final score, of the Super Power, being used in the calculation.
Quinn has a bat.
Batman beat Harley in the water, that's not fair.
Strength - Harley because she lifts up heavy things all the time lol
Speed - Ethan, without a doubt he's the better fighter. He's also held on to a plane that was lifting off. Don't forget that he has better reactions. Watch this right here. https://youtu.be/00rpUGdvcY0?t=60
Durability - Ethan can take in the pain tolerance because I think his pain supersession is tough as hell. He's gone into some serious situations that would be life or death and again the plot is all about the impossible. So I mean Ethan can probably take a bomb. His durability should be increased. 7 isn't too good.
Power - This has to go to Ethan again. He is always equipped with high tech equipment.
Combat - Draw, Harley is unpredictable and Ethan is just straight up spec ops. So I have no idea.
In the fight. I believe that Ethan would be suppressing Harley's fire. Meaning it would be difficult for Harley to get a good shot on Ethan. Ethan has tons of more experience and we only seen Harley in 2 movies while Ethan's been in many. In this fight Ethan wins because he's just a better well-trained soldier for Harley to handle.
Ethan can climb the Burj Khalifa which by the way is the tallest Building in the World, Can hold on the Side of a Plane, Etc
I Bet Harley would even survive or do any of the stuff Ethan can do