I'm VERY excited about 1080TI and won't let someone w/unrealistic expectations smother my joy.
Moore's law is dead so until we have a different processor paradigm 20-40% faster is a big deal. A VERY big deal, imo.
In addition to the core improvement there is an additional 10% gain using 1080TI w/hybrid or water cooling w/overclock. Then add in adaptive sampling and I'm ready to cook some pixels.
And...we may yet get some optimization on Pascal from Otoy. My hope anyway.
If someone needs real-time then look for Brigade and ORC.