"when it comes to.." is like "when we talk about.." or "when it is.."

example:

when it comes to food, my friends think of me.

when we/they talk about food, my friends think of me.

while "as for" is like "with regard to : concerning <as for the others, they'll arrive later>"

(c) meriam dictionary

i hope it helps you. :)

Thanks Joyce Ann. :)

They're really the same. Just different ways of saying it.