simple (and stupid) shell scripting question

#!/bin/sh

I have these lines in my script:

DIRNAME="`dirname \"$0\"`"
cd "$DIRNAME"
SCRIPTDIR="`pwd`"

What if I got rid of extra double quotes? Like this:

DIRNAME=`dirname \"$0\"`
cd "$DIRNAME"
SCRIPTDIR=`pwd`

Does this behave any differently in any kind of case? Are thes double
quotes just superfluous?
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