Please a piece of advice from you guys

Well, i'm pretty satisfied with my actual build and configuration. But 980 TI is already out and nerd in me is itching to purchase them. Is it worth to upgrade from 980 to 980 ti (SLI in both case). I cannot find any comparison of Overclocked 980 vs stock 980 ti for example. My cards run at 1560Mhz core 24/7 under water, but, as stated earlier, i cannot find comparison of the performance difference vs a stock 980ti.

My gut feeling is that is not worth the upgrade, but i would like to listen to...

Please a piece of advice from you guys

Please a piece of advice from you guys