IPC is actually the same, or even higher with AMD, it is clock speeds where Intel still win, and that is only of use for games which make use of higher clock speeds. when both intel and AMD processors are set to say 4ghz each, intel get thrashed in games. the AMD chips have a significantly greater overall performance advantage at the moment, both measured £ for £, and also in terms of 'just the best'. the 3900k basically matches kills the 9900k in virtually every useful performance benchmark. hell, the 3700k is a better chip than the 9900k.
Intel are screwed