Loma calmly admitted before the fight that Russel was faster than him. But timing + rhythm + punch selection > hand speed.
Loma made Gary look as if he didn't even belong in the same ring with him and he really didn't. Gary has handspeed but he is basically a flat-footed fighter.
I don't think Loma has top top tier handspeed, not compared to guys like Floyd, Pac, Russell, Gamboa or prime Donaire... But he's deceptively quick and his handspeed is definitely elite, you can see sometimes his speed is average but other times he throws some lightning quick punch(es) out of nowhere, that's because he changes the speed of his punches unlike some guys who consistently throw the most powerful, fastest punches possible.
I could see McGregor catching Khan and putting him to sleep. Is Khan more skilled? No ****. But Conor can crack and Khan is packing that glass.