I wouldn't upgrade the 50mm 1.8 to the 1.4, there are rumors that the 1.4 is going to be replaced. Also it's not much of an upgrade. Keep the 50, it comes in handy now and again.
The 85mm is ok, plenty sharp and great IQ. Just has a lot of CA between f/1.8 and f/2.8 around f/4 its mint. I wish I hadn't bothered buying it and just invested in something like a 135L at the time.
Depending on what focal lengths you like to shoot at you should prob invest in a good prime at that range.
Now I don't bother with the in between upgrades, I save up for the best because eventually that is what you'll end up with!