At this point, he is Kage level even without Kamui.
Only the likes of gated Gai, Naruto, Minato, shrouded Raikage, and Tobirama (maybe) fully outclass him in regular movement speed, and that's not exactly an insult. His Taijutsu is also top notch given his DB score and his track record of consistently sparring with Konoha's best Taijutsu user. He has the jutsu versatility (access to three elements with short, mid, and long range techniques at his disposal) to counter most jutsu and the intelligence to implement that versatility and make it matter. His Doton and clone feint combos have worked against top tier Dojutsu users like Nagato and Itachi. Chakra is no longer an issue given his ridiculous track record in this war, but of course some uninformed people still think we are in Part I of the series.
With Kamui, you're giving him an instant win button - its effectively the fastest offensive technique in the manga, and the second fastest technique in general after Hiraishin. Nobody barring FTG users, Naruto, and perhaps the Raikage have a chance at dodging Kakashi's current Kamui. His ability to warp himself between dimensions pushes his lethality even farther up given he can now hide and pull off effective sneak attacks.
He is easily mid to high Kage level. He is stronger than Mei and Tsunade even without his Mangekyo. He can beat Gaara without Kamui as well assuming he is restricted to gourd sand. With his Mangekyo he can probably beat the Raikage and Onoki as well. In general, there are only a handful of people that are clearly above Kakashi's level, and when that list only includes top-tier Jinchuuriki, EMS and Rinnegan users, and Sage Mode users, it isn't exactly anything to be ashamed of.
But of course we still have people who think his Kamui is so slow that Deidara can dodge it, and we also have people who think Kakashi will collapse after 1 Kamui, and we also still have people who think that Kakashi can only use the Sharingan for a few minutes. So yeah, who am I kidding? He's high Jonin level at best, amiright guyz?