Thanks so much everyone for chiming in!
I do have one EOS film body left at present, it's a 630 which works alright for my intent. I do all of my event and professional work digitally now (I know.. I know..) but I refuse to totally let go of film because it's my background!
I don't see myself shooting events or anything that would require a zoom, that's left to my digital gear. So I think I'll go ahead and sell the 35-105 as well. Does seem like a nice lens though.
I know the 28 f/2.8 isn't the most highly regarded lens, but is there another prime option that isn't that costly?