Well, I chose to run all cards at stock to make it more of an apples-to-apples comparison. Keep in mind that not a single Pascal card I've benched (I've purchased five so far) has achieved more than a 12% overclock. If you see way more than that in published reviews on press sample cards, you can bet they were cherry picked before being sent out for testing.
My Fury can hit 1120 (which ironically works out to 12% as well), so I think the days of sky-high overclocks are in the past. My GTX 980 achieved 20%, and the R9 290 can do that as well with voltage. The 980 Ti was somewhere in between, with one of my samples hitting 1400MHz and the other hitting 1450Mhz. I'd be happy to run a special "F2F Bench" of the 980 Ti at 1400MHz if you'd like.
EDIT: Woo-hoo, EA just released the lock on my BF1 license, after only 20 hours!!! How generous! Benching the 980 Ti shortly, along with 1080 and 1080 SLI!