Now, since I am not really a fan of SAO and don't know the others, I'll skip the comparisons and comment on the chapter.
This author is competent. The main character is charismatic and the plot is engaging. I also love the humour.
In this chapter, our suspicions are confirmed. Han Jee-han is, as far as we know, the only ability user who can tell others' levels. And even their names! Shin Sun-il hasn't realised it, but the advantage conferred by that on Jee-han is enormous.
For one thing, he can tell whether he can fight or whether it is better to escape or lie low given the chance. And I think this is going to be instrumental in the next chapters, because this just might become a friend-rescue-friend routine.
Shin Sun-il is probably going to seek out the Black Summoner to give him retribution for risking his friend's life (or maybe he - and other espers, too? - is already tracking him for other reasons, although that girl didn't seem to know him). But as far we know, he doesn't know his opponent is 18 levels above him (just as that girl back then probably also didn't, given how confident she was). And it makes sense, because unless power is tested to its limits, people above a certain level are probably indistinguishable from each other.
I really like how the author depicted Shin Sun-il, by the way. You noticed how he used almost the same close-up angle on his eyes while he was smiling that he used in the previous chapter when he was oozing murderous intent against whom he perceived to be an impersonator of his only friend?
Well, I think Sun-il's attempt to engage the Black Summoner will backfire badly. And in the end, one of Jee-han's banal skills will save the day.
Also, the way all aspects of the supernatural and real world are integrated into and even get showy names in Jee-han's gamer screens is really a nice touch, I was chuckling right along Sun-il.