redoing lens lineup

considering a jump to full frame, but what to do if i keep my 60D.

i have two lenses, an 85mm and a tammy 28-75 that i just dont use all that often, if anything the 85 will go and i'll keep the tammy.

but i was thinking, do i trade them for a solid walk-around like a 15-85 or just add a longer lens that i am clearly lacking, say a 70-200/4L ?

The 15-85 is an EF-S lens, so it will not work on full-frame.

yes, i know, this is if i decide to sell my 60D and get a FF.

I would get the FF first, and use what you have. The tamron 28-75 is a great day to day walk around lens, and the 85 1.8 is simply amazing on FF (it acts like your 50 on a crop, but better everything). The 50 1.4 works for a lot of folks too, so before you sell any of your EF lenses, try them out first. It's a big jump going from aps-c to FF.

Those unused lens might be used more on full fame when you try it.

yes, yes i know im not sure if im going to Full frame or not.

if i do go full frame, im keeping them all.

Your 10-22 will not work on a FF. But your other lenses will. You can pick up a 16-35 to cover the 10-22 that your missing out on.

Before going to FF, what is it that FF can do that your 60D can't do?