Before this thread gets locked, let's get it back on track.
So briefly today, I went to e-earphone and tried my DX100 with a bunch of different headphones. This thing can drive up to the HE-6 (almost at full volume though), and slightly lower volume the HE-500. It could drive the LCD-2R2, LCD-3, and HD800 easily. As these were open and I was in a shop, it's hard to say if it drove it to the full capabilities of each headphone. However I'd say that it drove them well enough - decent.
Unfortunately my DX100 battery died before I got to A/B head on against the Sony Z series (for uelover) but I had a 20 min gap in-between my DX100 going flat till I got to (re)listen to the Z-series. Since the Z doesn't take cards, I had to go with whatever demo J-Pop they put on the internal memory.
A few weeks back,
I demo-ed the Z-series and I was very impressed with it's SQ. But after listening to the DX100 pretty much the most of today, the Z-series didn't thrill me as much as it did 3 weeks ago. I'm @turokrocks and @OK-Guy will have their own opinions and they can do a better job of doing a direct comparison between the DX100 & Z-1070 however IMHO, if you can afford to wait for the DX100, do it.
The DX100 music interface does bug me still though. And although possible, I personally don't recommend treating the DX100 as a jukebox and dumping all your music on it. Especially when you start to have over 530+ albums & 6600 songs, it slows down painfully. I'll probably re-organise my music such that it handles a few large (FLAC) tracks.