Don't see the RTX 2060 as a good value. It offers about 40% performance gains over the GTX 1060 6GB for about 40% higher price. Essentially you are not getting any improved performance price for price.
And again the RTX 2070 trades blows with the GTX 1080, the biggest advantage being in Vulkan games, and slightly better DX12 performance across the board, so essentially -2%-5% performance depending on the gpu model, game, etc...
So the RTX 2060 is trading blows with the 1070ti, but in certain games it performs as a GTX 1070. I suspect this is because of the significantly cutdown ROP count and 6GB of vram at 192bits.
So essentially 25% up to 40% faster than a GTX 1060 6GB, generally on par with the GTX 1070ti, but in some games it performs as a 1070.
Hopefully the GTX 1160 will offer better value. That card should be $250 and offer 30% faster performance than the GTX 1060 6GB to be better in terms on the GTX 1060 6GB, but even that would be bad value in terms of upgrade from a GTX 1060, as 25-30% performance increase for the same price is not that big of a jump.
I'm not planning to "upgrade" this generation anyways, I always skip one generation, because there is never good value in upgrading like for like every generation. The generation after Turning would actually bring in the value upgrade path and with 7nm I fully expect the GTX/RTX 3060 to be at least 50% faster than the GTX 1060 6gb for $250. Hopefully something closer to 60% performance increase.
And I really hope AMD brings something good to the table, if they can release mainstream range gpu's around July on 7nm and price them very competitively, I will definately be upgrading with an AMD card.