I seriously doubt it will perform as well as a 6900k, unless you are interested in running blender.
As I said before, intel's 6900k is overpriced by $600, because they have a monopoly on the market. The 8 core should have dropped down to the $600 range when the 10 core broadwell-e came out.
What should have happened,
6800k - Gone
6850k - $400
6900k - $600
6950x - $1000-1100
Yes and then they can drop the price of the 1151 desktop models
and then they can drop the price of the E3 and E5's
and then they can scrap Xeon D because theirs no point anymore
and then When the APU's come out they can drop the price on all the laptop parts as well.
All while AMD probably can't hit 10% of intels production total.
At the end of the Day intel massively slashes its profit forecast/result, no one at intel gets paid a bonus, share price takes a big hit and all the CxO's get fired.
Its not 2003 anymore its not massive growth everywhere, markets are ranging from slow growth to full reverse. Add on top of that thax to bad bond returns and low interest rates many people have had to up their investment risk profiles and moved to shares, as a result these investors want higher dividends ( and they have been getting them).
Intel will do whatever makes them the most money( because the dividends are demanded ), That could even be to not respond on price at all.