I agree with the bass being a good feature of the HD800. The HD800 bass quality is really good, just the components need to be matched as it was said.
I listen electronic, new wave, pop, rock, all genres wich need much impact. One year ago i bought an HifiMan He-500 for its known bass impact (I've had all top Sennheisers in 40 years, last one was HD600). I amplified HifiMan HE-500 with Emotiva 50+50w, the bass impact was very good but the headphone lacked in all other sectors (bass quality and clarity, highs extension, sensitivity, headstage, wearability).
Not satisfied from HE500 (bass included) and having owned only Sennheisers for 40 years, I decided to give a chance to the HD800, though many people told it was lacking bass and so was not good for my genres and that it was for classical-lyrical music (not my genre).
From the first moment i listened to HD800 (attached to an old vintage Nikko integrated amp, so nothing special) I was really (really!) impressed from this headphone, particularly for the clarity and extension of bass (totally unexpected) and highs quality and extension.
4 weeks after, I bought the Sennheiser HDVA600 amp and the Sennheiser balanced headphone cable. From that moment on, the HE500 was left alone, then i sold it after some months with no regrets. Surely the HE500 impact was more than the hd800 (but not that much), but to me the HD800 bass is fantastic, is right and well amalgamated with other frequencies. You can easily follow bass riff, impossibile with the other headphones I've had.
This is just my experience regarding HD800 bass, a surprise for me and I love it everyday more, toghether with all the other HD800 characteristics. I love listening Giorgio Moroder (70-80's) particularly with this headphone, that's all said.
It's the first headphone for which i don't feel the need of an external equalizer and it's the first headphone in 40 years (Sennheisers included) that makes me difficult to stop listening sessions, this is the only issue I found with HD800 (seriously).