I haven't used the other headphones (in fact the HD595's are my first "high-end" headphone, so I don't really have much of anything of worth to compare them to), but I absolutely love my 595's.
The bass isn't heavy, so it's not going to blow you away by shaking your head off or anything, and it won't add bass to tracks where there isn't any there, but what bass is there sounds very clean, accurate, and smooth, and if the recording you're listening to does have a lot of bass, it'll let you know it. It's probably actually a more "accurate" representation of the bass in the recordings than other headphones with exaggerated bass (not to say exaggerated bass is a bad thing--it's all a matter of preference, and a headphone with more bass would probably be easier to get used to for someone who's used to listening to loudspeakers with a subwoofer. I'll admit it took a bit of listening for me to get used to the bass on these after being used to the loud, boomy (and muddy) bass on my PC speakers' subwoofer, but now I have a hard time listening to my speakers anymore because I've fallen in love with how much detail and clarity my 595's give me in the bass, that my subwoofer is simply incapable of re-creating. I feel like I'm missing huge parts of my music when I listen to my subwoofer).
They're also very comfortable, and just all-around great sounding phones, with an insane amount of clarity and detail. I listen to music (mostly rock (both electric and acoustic), some electric/industrial, metal (thrash and power metal, primarily), and some orchestraic), and I play games and watch DVDs with them. FYI, I'm using them with a HeadRoom Total BidHead amp plugged into my PC's USB. Putting the BitHead through the USB helps clean up the sound a bit (it really helps to get rid of the noise from inside the computer in the signal, which is noticeable in black spaces in the sound), but my X-Fi card also runs them well and sounds very good.