Yes there is! A lot actually. You cant have a perfect roll on just 0% quality , maybe its possible but its a very long shot and have to waste millions of crystals to obtain a perfect roll. +25% however has a higher chance of having a perfect roll.
Sometimes dropped items that has at least 9% quality can have a perfect affix. In enchanting an item however would be almost impossible in obtaining it.
Yes, if you are talking abt epic affixes, it is easier to have perfectly rerolled epic affixes at max quality.
In legend affixes, quality doesnt do much at all(from experience)
?_?
Nah, if you are talking abt quality. iLvl is the only factor that can affect max value you can obtain by rerolling