I think you are being selective in the benchmarks you are showing. The 1070 and the 980 ti scale much better as the resolution increases. These cards are made for 2560 x 1440 and above. This is taken from the same review you mentioned.
All things said, this is just ONE game. Over the past 2...
I think it was unrealistic to expect any more... Especially as the game might be limited by the 3.5GB + 0.5Gb memory config and you are asking your cards, to push 5 million pixels around in ultra detail.