Nobody realistically expected them to be that much faster than 980Ti. They seems to be 10-30% faster depending on game/resolution etc. Pretty in line with the 980, 780, 680 and so on.
As always, if you have the top end from the last gen it's probably not worth upgrading unless you absolutely must have the best.
The 1070 is much more interesting for lots of people who skipped a gen or never buy the top end (myself included).
Expected them to be faster because they were a die shrink.. In the past when we had a die shrink it wasn't this tiny "usual" speed bump. I could understand if it was the same manufacturing process but it isn't. They are just milking it now to the max.
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