Because there is another thread asking for any update reviews on Karl Kang, I will add my experience to this main thread on him.
TL;DR summary: Wow. I can recommend without hesitation.
Longer summary: I am very partial to clean-cut, smooth, muscular guys. Karl fits that exactly. The only other guy who fits my preferences so well is Gio in NYC. And the experiences are quite similar, though Gio will go full BFE.
I booked a last-minute two hour session with Karl. The massage was A-grade, more Thai-style (I guess), though he went deep at times. The extras were quite enjoyable though it's clear that it won't fully crossover into a BFE. I could tell that Karl enjoyed our session as well as I did.
I saw Karl earlier, a couple of years before COVID. That experience was good but kind of *meh* so I didn't go back. I'm not sure whether he changed or I changed. Like Gio in NYC, he seems to be aging in reverse and is still able to keep a fabulous body.
Highly, highly recommend for a great massage with great extras.