I actually like the notion that in order to make BQ you need this:
quote:
Manufacture: For explanations of item quality, see WFRP
pg. 105. A tradesperson’s capability depends on the
number of skill mastery levels:
Skilled: Common quality items
Mastery +10: Good quality items
Mastery +20: Best quality items
So basically your skill level sets your peak. That levels things a bit.
That said a perfect check(All successes, on all dices), will raise the quality a level from standard.
So no, the materials are the same generally, for all items, but the skill level is the difference maker.