Nah mate, this AMD we are talking about here, it will be 1070 performance at best innit. Don't get your hopes up bruv, AMD don't have da R&d money's so Vega is doomed. 1080ti is just sick blud, best drivers and performance!
On a more serious note, bet at the very least it will beat the 1080ti in DX12 and AMD games like doom. Oh and I agree, if anything driver wise AMD is ahead of Nvidia in my experience, nvidia driver take much longer to load and ui is very old. The only two things AMD drivers lack feature wise that I can see is adaptive v-sync and fastsync.
WUT? I don't speak cockney
I still don't expect vega to outperform 1080ti. Only will be close in DX12 titles. At best it will be close to 1080ti. Even a founders edition has more than 12.5Tflops when it boosts. So AIB models boost to around high 19xx to 2Ghz. Seriously Top end Vega will need to have boost clocks of around 1700 to get close.