As I mentioned before, I now have both the P7 and the HP50. What surprises me is how my experience (so far) deviates from Tyll's observations.
He left the P7 off the "wall of fame" due to:
• The "bass hump" (I noticed it on some tracks but see below...)
• The comfort (I didn't have much of a problem with the comfort; somewhat subjective)
• The cost (relative; the construction seems worth it, compared to other sets)
The HP50 did make it to "the wall".
• Surprisingly, I found the bass on the HP50 to be more problematic than the P7. It seems even broader and more intrusive, especially on some tracks.
• The comfort is pretty good, due to the lightness of the 'phones, but it fits a bit more like an on-ear, since it doesn't totally encapsulate my ears.
• Yea, it's a C-note cheaper. No "Emma Peel" leather and chrome, but the materials make it lighter.
My main problem with the P7 (as I've mentioned several times) is a curious "spike" in the upper mid / lower treble area.
It only shows up on some material but it's unpleasant. It's like an occasional note jumps out of the mix, with a piercing jolt.
I haven't seen others mention this, so maybe it's just me?!
I can detect the emphasized notes on other cans (using the same source and material) but they don't "jump out" like they do on the P7.
Some EQ can make these two excellent headphones sound more alike.
I'm still trying to decide between the two, although I'm (somewhat reluctantly) leaning towards the HP50s...
Somehow their upper end retains some sparkle without the intermittent spiking...and I can always attenuate the bass if needed.