Your equipment is more than sufficient. That 85mm 1.8 is my next lens(well, the Nikon version).
You don't need L series lenses. They are great, don't get me wrong, but with what you got now, you have much room for improvement.
<-- If you want critiques, post and ask about em in here.
<-- Any equipment questions, post and ask about em in here.
There are many talented individuals that post in there. I wish I was even 10% as good as most of em.