According to tpu, the Fury X added around 37% to the previous gen's flagship (290x) at 4k, while consuming a bit less power on average when gaming.
https://www.techpowerup.com/reviews/AMD/R9_Fury_X/31.html
This is what I mean when I'm saying we're muddying the waters. This is from Fury X launch. I literally just posted an aggregate graph that's recent as of 11/15. You could get one that's recent too.
Using the sweclockers graph I posted it's 33%.
Using the most recent techpower up review and lets say the 290x and R9 390 are on par.
It's 23%.
That's bad. Why try to defend this?
Look at the Sweclockers graph I posted.
63% increase between Titan X to Titan XP. You know you'll see similar for the 980Ti to 1080Ti. I mean, if I was assured a 60%+ increase from Fury X flagship to the Vega Flagship I'd be happy. Instead, people are defending the mediocore gains Fury X has over a 290x.
If you use the 390x like I did which I admit is unfair, but I use the 390x since I am using it like considering it to be an aftermarket 290x, then it's far worse....
Edit: How much of an improvement is Vega over Polaris? Because I base a lot of my feeling of Vega off Polaris, but if Vega is quite the improvement in architecture I might be pleasantly surprised. Especially if they expand on the Fury X design which I am a huge fan of. But if it's just Polaris with minor changes and HBM.... I'll be an angry camper forever.