EU: 11.29.2013  11.22.2013  Optical Drive Blu-ray/DVD  Blu-ray/DVD  Game DVR Yes, PS+ subscription not required  Yes, with subscription to Xbox Live Gold  RAM 8GB GDDR5  8GB DDR3  CPU Single-chip x86 AMD "Jaguar" processor, 8 cores 8 Core Microsoft custom CPU GPU AMD Radeon Graphics Core Next engine w/ 1152 shaders  853 MHz AMD Radeon GPU w/ 768 shaders Peak GPU Shader Throughput 1.84 TeraFLOPS/s 1.31 TeraFLOPS/s (estimate)[19
So yea.. Ps4 is slightly more powerful as compared to Xone. You wont even notice a difference in the games during the first 2-3 years, but then you will start to notice differences as the next gen becomes current gen and games become more demanding. That Ram difference will favour PS4 and you will notice it. So even if its a minor difference, if you think about it.. xbox one users will be paying more for a game console that is slightly weaker than the cheaper one.
BUT its all a matter of preference, some guys may love the Kinect stuff, for which $100 may be justifed.