I woke up a while ago as usual.
And as usual, I was listening to music with my K701 while making some coffee.
And I finally decided to bother to read this thread.
Ok, several things.
1.) Bass of K701 is nearly enough; among headphones I've heard, owned and currently own, it has perfect balance. If you think bass from K701 is lacking, then you are too used to today's muddy, boomy sound.
2.) HD800, IMO, has exact amount of bass that headphones should reproduce. Nothing more, nothing less. It indeed has stronger Bass than K701, but not much difference really.
3.) No, sadly K701 is NOT better than HD800. But it is very close... like, 85% close. Nothing really can outperform K701 in similar range. You are getting 85% performance from headphones which is at least 4 times more expensive.
4.) With current quality of mastering, sadly again, both K701 and HD800 are NOT suitable for modern rock and other pop stuffs. They shine most with any well-mastered recordings (which only few exist if you only look for modern music), and they have perfect synergy with Classical in general and Jazz. But when bricked songs go into the pipe, at worst they become torture machines, at best serious annoyance.
5.) Thus, you better go for headphones that are more forgiving and have bass boosted. In no particular order I can think of now:
HD650
T1
D2/5/7000
Kenwood KH-K1000
I strongly recommend Kenwood KH-K1000, Beyer T1 or HD650.