Is there anyone better than Nemesis?

As a master in disguise and cheating death?

Cheating death? Any of the core X-Men probably beat him 😛

As a master of disguise he's pretty tough to beat, he managed to whip up a White Ape disguise on the fly once.

I think for fairness purposes the master of disguise contest should exclude natural shape-shifters and illusionists.

chameleon...but illusionists aside no clue

Batman.

The answer to "Is anyone better than someone at something" is always Batman.

the foreigner

the answer to "is anyone better than batman at something?" is always the foreigner

better master of disguise? classic chameleon