You don't have to take my word, you can visit the Philips website and compare both models.
Can you provide links? I can't find the X2 on Philips's website.
I'm looking into buying either the Sennheiser HD 598 or the X1, unless the X2 adds something worthy of sound quality. I am yet to find any sound improvements on the X2 other than angled drivers, different cable (easily fixable on X1 as previously mentioned), and something with dampering. Whichever I get will be my first audiophile grade headphones. As are the rest of us, I am awaiting a comparison review of the X1 and X2, and I'm hoping that it comes soon.
Long story short, I was forced to reinstall my OS due to stupid network drivers, and now my old headset software doesn't work (hit or miss with it apparently). Logitech's support is utterly useless. I told them my headset was the G430, and described my issues, yet they got literally every detail I gave them wrong, and aren't responding to my follow up emails. They're supposed to know their products well, however they put the 430 down as wireless lol.
Anyways, I'm planning on getting the Sound Blaster Z card, and I'm going to use these headphones for gaming and music primarily. Sound stage is key, as I'm gaming. Positional audio is a huge factor in my buy. I love bass, not to where it's overwhelming, but I like it slightly higher than neutral. This headphone sound right up my alley, I can't wait until they become available in the US!