No the essence of sybil is that you can make one appear to be many (and get more votes or whatever benefit it is from appearing to be many). You can't do that with ASICs. One is just one.
Everyone is using ASICs now so there isn't really anything disproportionate about it.
An ASIC is one. One chip, custom designed to only do hashes. That's disproportionate power in its essence.