It is a nice increase for the Fiji cards but the thing to remember is the comparison is against a reference 980 Ti using stock clocks, old drivers and stock voltage.
They were using 358.50 for all NVidia cards and 15.9.1 Beta for all AMD cards. The thing is, as someone already pointed out, the games changed between the old system from the older results and the new system with the new results so it's not really a fair comparison.