Recently, I sent what was my beautiful 85mm f1.2L in for repair, via my local photography store. About 8 years ago, the lens had fallen out of a camera bag, attached to it's camera (I think it was a 20D).
Alas, the original estimate was far wide of the mark, when Canon announced due to a broken motor, they would have to charge $1700 for the repair. This, I had to decline.
Someday, I'll again have the 85mm, probably the new Mark II.