That's hard to tell if you want to hear GHz or GFLOPS.
A Skylake core at 3.2 Ghz is roughly 5 times more powerful than a Xbox 360 Xenon core with the same clock speed.
And I doubt that Nintendo could make an emulator as efficient as the Xbox 360 emulator on Xbox One. They aren't that good at making emulators tbh, there are more accurate emulators out there than their Virtual Console games.