IMO, UA's flat seats are far better than any angled seats out there. Some are noticeably better than others (NW), while others are essentially useless in their flat mode (LX), but none can really compete with a full flat seat for sleep. I also find that most angled seats are quite firm. (Actually, they are just too darn hard for my heavenly bed tastes. )

The NZ flat seat is quite comfortable for sleeping but I take points off for having to get up to convert it into a bed rather than just reclining into the bed mode. AC/DL seats are do this, so it's possible. Who needs all that extra stimulation on a plane when you just want to drift off to sleep?

I have just returned from a trip where I got to try the new SQ seat, and once you get past the Oh Wow! appearance factor, I have to say that I was underwhelmed by the seat. As with NZ, you have to get up to convert it into a bed. The seat is really too wide to be just a seat, but not quite wide enough to be a sofa, so I squirmed around a lot to get comfortable. In the bed mode, both your head and feet are in a narrow space in order to make up for the 55" seat pitch. Finally, I found the cabin somewhat claustrophobic once you were in the seats. Felt like I was in an office filled with cubicles.

But as to the old UA barcalounger, I still find it to be one of the most comfortable seats (as in, not a bed) out there. As long as everything worked.