Pricing between the 2 consoles seems pretty equal. Amazon have the X1 listed at £324 and the PS4 at £329 and both can be had with a game for £349. Game have the PS4 with Fifa 15 and The Last of Us for £349. Shopto also have the X1 listed at £324 and the PS4 at £329. Everywhere I seem to look the PS4 has also had its price reduced.
Either way I've just pre-ordered an X1 with Forza Horizon 2.