Saved around $400 (don't have exact numbers in front of me) on an IAD-SVO round-trip in the summer, on AF and KL. It was $2,800-ish online, and I got it for around $2400, in business class. Booking code is Z.

Did find one interesting thing -- I was pricing a different routing with the agent, I think it was DME-MUC-YUL-IAD, with the first 2 legs LH and the last leg AC. On the ticketing portal I was using, the YUL-IAD was an LH codeshare operated by AC. So they couldn't price it using IAP since AC isn't part of IAP. I was thinking to just have them price is to YUL then I'd book my own flight YUL-IAD, but ended up choosing different flight routing for other reasons.